Effect of Integrated Inorganic and Organic Fertilizers on Yield and Yield Components of Barley in Liben Jawi District

Abera, Tolera; Tufa, Tolcha; Midega, Tesfaye; Kumbi, Haji; Tola, Buzuayehu

doi:https://doi.org/10.1155/2018/2973286

International Journal of Agronomy

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Abstract Introduction Materials and Methods Results and Discussion Conclusion Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2018 | Article ID 2973286 | https://doi.org/10.1155/2018/2973286

Effect of Integrated Inorganic and Organic Fertilizers on Yield and Yield Components of Barley in Liben Jawi District

Tolera Abera,¹Tolcha Tufa,¹Tesfaye Midega,¹Haji Kumbi,¹and Buzuayehu Tola¹

Academic Editor: Yong In Kuk

Received26 Jul 2018

Revised25 Sept 2018

Accepted14 Oct 2018

Published14 Nov 2018

Abstract

Barley is an important food and beverage crop in the highlands of Ethiopia, although intensive cultivation and suboptimal fertilizer application have caused nutrient depletion and yield decline. With this in view, integrated inorganic and organic fertilizer sources on yield and yield components of barley were studied. Ten treatments involving the sole NP, vermicompost, conventional compost, and farmyard manure based on N equivalency were laid out in a randomized complete block design with three replications in 2015 and 2016 cropping seasons. Significantly higher grain yield and biomass yield of barley were obtained with the application of sole recommended NP and the integrated use of 50 : 50% vermicompost and conventional compost with recommended NP. Mean grain yield of 2567 and 2549 kg·ha⁻¹ barley was obtained from application of 50 :50% conventional compost and vermicompost based on N equivalence with recommended NP fertilizer rate, which markedly reduce the cost of chemical NP fertilizer required for the production of barley. The economic analysis confirmed the profitability of the integrated use of 50 : 50% conventional compost and vermicompost with recommended NP fertilizer for barley production. Therefore, the integrated use of 50 : 50% conventional compost and vermicompost based on N equivalency with recommended NP fertilizer was recommended for sustainable barley production in Chelia district and similar agroecology.

1. Introduction

Barley (Hordeum vulgare L.) ranks fourth among cereals in the world and is grown annually on 48 million hectares in a wide range of environments [1]. Ethiopia, the second largest barley producer in Africa, accounts for about 25 percent of the total production in the country [2]. CSA [3] reported that barley is the fifth most important cereal crop after teff, wheat, maize, and sorghum in total production in the country. The majority of barley production is food barley with its share estimated to be 90 percent compared with malt barley [4]. However, the national and regional yield of barley has remained below 1.3 t·ha⁻¹ [3], whereas the potential yield goes up to 6 t·ha⁻¹ at experimental plots [5]. This lower yield of food barley is attributed to lack of improved varieties and poor soil fertility management [6]. Soil fertility is the most limiting factor for barley production in the highlands of Ethiopia [7, 8]. Furthermore, in Ethiopia, low productivity of barley is due to low soil fertility and poor agronomic practices [9]. Tolera et al. [10] reported that low productivity of barley is mainly due to traditional methods of production and poor soil fertility. The recommended fertilizer rate for barley production in the central highlands of Ethiopia, in the form of di-ammonium phosphate, is mainly at rates of 9/10 to 18/20 kg·N/P ha⁻¹, which are suboptimal rates for barley production [11]. Woldeyesus et al. [8] reported that the application of P fertilizer increases N use efficiency and thus mines soil N when N is in short supply. However, chemical fertilizer usage by the resource-poor subsistence farmers in Ethiopia is insignificant and inadequate [12]. However, Getachew et al. [13] reported that continuous applications of inorganic fertilizers alone resulted in deterioration of soil health in terms of physical, chemical, and biological properties of the soil. Organic fertilizer application has been reported to improve crop growth by supplying plant nutrients including micronutrients as well as improving physical, chemical, and biological properties of the soil, thereby providing a better environment for root development by improving the soil structure [14].

Thus, the application of inorganic or organic fertilizers alone did not bring a sustainable increase in yields [15]. MoA [16] reported that research efforts on how to use farmyard manure (FYM) together with low rates of mineral fertilizers could be one alternative solution for sustainable fertility management for barley production. Likewise, Shata et al. [17] suggested that by the use of mixed chemical and organic fertilizers not only production can be kept at optimum level, but also the amount of chemical fertilizers to be used can be reduced, which had negative impacts on cost production and environments. Abay and Tesfaye [18] found higher barley biomass yield of 8259 and 8065 kg·ha⁻¹, and other agronomic parameters at Adiyo and Ghimbo were obtained with the application of 5 t·ha⁻¹ FYM in combination with 75% inorganic NP.

Limited agronomic studies in line to integrated nutrient use call to conduct research on integrated nutrient management practices and recommend best practices in order to maximize yield potential of crops such as barley [11]. Integrated use of organic and mineral fertilizers for tackling soil fertility depletion and sustainably increasing crop yields had a paramount importance [9, 13, 19]. Many research findings have shown that neither inorganic fertilizers nor organic sources alone can result in sustainable productivity [20]. Integrated soil fertility management involving the judicious use of combinations of organic and inorganic resources is a feasible approach to overcome soil fertility constraints and contribute high crop productivity in agriculture [21]. Hence, no information is available on the yield potential of improved variety with integrated nutrient management practice in ultisols of Ambo. The integrated use of chemical and organic fertilizer rate is needed to investigate in order to utilize the potential yield of improved barley variety in the area. Therefore, the objective was to determine the effect of different integrated organic and inorganic fertilizers on grain yield and yield components of barley in ultisols of Chelia districts.

2. Materials and Methods

The experiment was conducted in humid highland agroecosystems of western Oromia National Regional State, western Ethiopia. It was executed on farmers’ field around Toke Kutaye in 2015 and 2016 cropping seasons. It lies between 8°9′80″N N latitude and 37°71′E longitude and at an altitude ranged from 2273 meter above sea level, receiving mean annual rainfall of 1040 mm with unimodal distribution [22]. It has a medium cool subhumid climate with the mean minimum, mean maximum, and average air temperatures of 8.9, 27.4, and 18.1°C, respectively [22]. The soil type is brown clay loam ultisols [23].

The experiment was laid out in a randomized complete block design with three replications, and the plot size was 4 m × 3 m. Ten rates of sole and integrated organic and inorganic fertilizer (T1: recommended NP (64/46 kg·NP ha⁻¹), T2: conventional compost (based on N equivalency of recommended. N), T3: farmyard manure based on N equivalency of recommended N, T4: vermicompost based on N equivalency of recommended N, T5: vermicompost (50% of treatment 4) + conventional compost (50% of treatment 2), T6: vermicompost (50% of treatment 4) + FYM (50% of treatment 3), T7: vermicompost (1/3 t/ha) + conventional compost (1/3 t/ha) + FYM (1/3 recommended), T8: vermicompost (50% of treatment 4) + 50% recommended NP, T9: conventional compost (50% of treatment 2) + 50% recommended NP, and T10: FYM (50% of treatment 3) + 50% recommended NP)) were used for HB-43 barley variety. Sole and integrated inorganic and organic fertilizer rates were applied at planting. All other agronomic management practices (ploughing four times with oxen, time of sowing (early July), seed rate (150 kg·ha⁻¹), and two times hand weeding) were applied as per recommendation for the barley production. Different agronomic parameters such as plant height was measured in cm from five plants sampled randomly from the central rows using graduated meter one week before harvesting and summed and divided by the number of plants to get the height of each plant, spike length was measured in (cm) from five plants’ spikes sampled randomly from the central rows at harvesting using graduated meter, summed and divided by the number of plants’ spikes to get the length of each spike, total number of tillers plant⁻¹ was counted from ten plants sampled randomly from the central rows at harvesting, summed and averaged to obtain the number of tillers plant⁻¹, dry biomass yield was weighed from above ground harvested plants per plot and converted to dry biomass per hectare in kilogram, grain yield was taken by threshing the harvested plants per plots, and grain yield per plot was weighted and converted to yield in kg·ha⁻¹ adjusted to 10% moisture, thousand seed weight was taken by counting 1000 seed number from the bulk of trashed grain weight at 10% moisture level and weighed using a sensitive balance expressed in gram, and harvest index was computed as a ratio of grain yield to dry biomass yield ∗ 100 and expressed in % of barley were collected. The collected data were computerized and analyzed using SAS computer software [24]. Mean separation was done using least significance difference (LSD) at 5% probability level [25].

Economic analysis such as partial budget, value to cost ratio, and marginal rate of return for barley grain yield was valued at an average open market price of EB 1200 per 100 kg for the last 5 years. Labour cost for field operation was EB 28 per man-day. The yield was adjusted down by 10% to reflect actual production conditions [26]. The cost of fertilizers (urea and DAP) was EB 1090 and 1390 per 100 kg with current market price. The cost of farmyard manure, conventional compost, and vermicompost was estimated by considering preparation, application, and its price costs 20, 40, and 30 EB·kh⁻¹.

3. Results and Discussion

3.1. Plant Height, Spike Length, and Total Number of Tillers Plant⁻¹ of Barley

The mean plant height, spike length, and total number of tillers plant⁻¹ of barley are indicated in Table 1. Mean plant height of barley was significantly () affected by the sole and integrated use of inorganic and inorganic fertilizer application. Significantly taller (104 cm) mean plant height of barley was obtained from the application of recommended NP fertilizer followed by 50 :50% vermicompost and conventional compost with NP fertilizer (Table 1). Similarly, Woubshet et al. [27] found significantly higher plant height of barley with the integrated application of lime, balanced fertilizer, and compost in Wolmera district. Correspondingly, Mitiku et al. [28] found a significant effect of combined application of organic and inorganic fertilizers on plant height barley at Adiyo and Ghimbo with the application of 5 t·ha⁻¹ farmyard manure + 75% of recommended NP and 5 t·ha⁻¹ vermicompost and 75% of recommended NP. Likewise, Getachew [29] reported that the use of organic manures in combination with mineral fertilizers maximized the plant height of barley. Similar result was reported by Ofosu and Leitch [30] and Amanuliah and Maimoona [31]. Mean plant height performance of barley varied across years with higher in 2015 cropping season (Table 1), indicating variations in environmental factors (rainfall and temperature) and soil fertility status across smallholder farmers’ fields. Similarly, Kassu et al. [32] found cropping season significantly affected most of the measured variables of malt barley. The mean spike length and total number of tillers plant⁻¹ of barley were significantly () affected by the sole and integrated use of NP and organic fertilizer sources (Table 1). Higher spike length of barley was obtained from the application of sole NP and 50 : 50% NP fertilizer with organic fertilizer sources. Similar result was reported by Kumar [33] and Shantveerayya et al. [34].

Significantly higher total number of tillers plant⁻¹ of barley was obtained from the application of sole NP and 50 :50% NP fertilizer with organic fertilizer sources. This indicates the easy availability of nutrients from inorganic fertilizers as compared to the gradually release of nutrients from organic fertilizer sources. Getachew et al. [35] found that the integrated application of organic with N fertilizer rate significantly improved productive tillers of barley at Holetta and Robgebeya. Likewise, the application of 5 t·ha⁻¹ FYM combined with 75% inorganic NP gave the highest number of productive tiller m⁻² (227 and 215) [28]. Kumar [33] reported that the number of total tillers plant⁻¹ was significantly increased with the application of nitrogen fertilizer. The result was in agreement with the findings of Prystupa et al. [36], Iqtidar et al. [37], Sepat et al. [38], Tariku [39], and Kassu et al. [32] in malt barley.

3.2. Grain Yield and Thousand Seed Weight of Barley

The mean grain yield and thousand seed weight of barley are indicated in Table 2. Mean grain yield of barley was significantly () affected by the integrated use of NP fertilizer and organic fertilizer sources in 2016 and combined mean (Table 2). Significantly higher mean grain yield of barley was obtained with application 50 : 50% vermicompost and conventional compost with recommended NP fertilizer followed by conventional compost and NP fertilizer indicating better contribution of integrating NP fertilizer with organic fertilizer sources. Similarly, Mitiku et al. [28] reported that the application of inorganic fertilizers (NP or NPK) with FYM gave a better yield of barley than the application of 100% inorganic fertilizers alone. Correspondingly, grain yield of malting barley was significantly increased by the combined application of organic and mineral nutrients [32]. Likewise, Assefa [40] and Getachew et al. [35] also reported similar results on barley. The application of organic fertilizer with inorganic fertilizer could directly increase yield, improve soil fertility status, and reduce the cost production. The improved yields of barley due to combined application of organic and mineral amendments resulted from positive changes to the soil, including increased soil pH, available P and total N, and possibly other macronutrients and micronutrients [32, 35]. Likewise, the combined application of inorganic and organic fertilizers was widely recognized as a way of increasing yield [41]. Higher yields were obtained with the application of compost or compost + biochar, and the highest yields were achieved in combination with moderate rates of applied N [35]. Integrated use of organic and inorganic fertilizer is economizing the input cost for barley production. The chemical fertilizer required to achieve optimum yield levels can be decreased with the application of organic fertilizers [42]. Besides, yield increase, environmental benefits, soil quality, and quality food test with the application of organic fertilizer were higher in different crops. Significant improvement in the quality characteristics of the soil amended with biochar, compost and compost + biochar while the growth and yield components of barley supplemented with organic amendments and lower N fertilizer rates showing the enhanced synergistic effects of mixed treatments [35]. The second higher grain yield of barley with reduced rate of inorganic fertilizer might be due to improved nutrient use efficiency and stimulated barley growth by organic fertilizer sources, which is in agreement with the results of several findings [35, 43–45]. Therefore, the integrated use of inorganic and organic fertilizer sources has improved yield and other soil and environmental benefits, which enhance sustainable production barley.

Combined mean over years of thousand seed weight of barley was significantly () affected with the integrated use of NP fertilizer and organic fertilizer sources (Table 2). Similarly, Abay and Tesfaye [18] reported that higher thousand grain weights (45 g and 44 g) at Ghimbo and Adiyo were obtained with the application of 5 t·ha⁻¹ FYM in combination with 25% recommended rate of inorganic NP and 5 t·ha⁻¹ FYM in combination with 75% recommended rate of inorganic NP, and the lowest thousand grain weights were recorded from the control plots for both locations. Likewise, Saidu et al. [46] reported higher 1000 grain weight, from the application of 5 t·ha⁻¹ FYM in combination with 50% inorganic NP while the lowest from no fertilizer application. Getachew et al. [35] also found that amendment of organic with N fertilizer rate interaction significantly improved thousand grain weight barley at Robgebeya.

3.3. Biomass Yield and Harvest Index of Barley

The mean biomass yield and harvest index of barley are indicated in Table 3. Mean biomass yield of barley was significantly () affected by sole and integrated use of NP fertilizer and organic fertilizer sources. Likewise, Kassu et al. [32] reported that the total above-ground biomass of malting barley was significantly () increased by the combined application of organic and mineral nutrients. Significantly higher mean biomass yield of barley was obtained from the sole application of NP fertilizer followed by 50 :50% vermicompost and conventional compost with NP fertilizer rates. Likewise, higher biomass (11,514 kg·ha⁻¹) yields of malting barley were obtained from the application of recommended rate of NP (36–20 kg·NP ha⁻¹) from mineral sources (DAP and urea) [32]. Similarly, the application of 5 t·ha⁻¹ FYM in combination with 75% inorganic NP gave the higher biomass yield of 8259 and 8065 kg·ha⁻¹ at Adiyo and Ghimbo [18]. Getachew et al. [35] also found that the interaction of organic amendment by N fertilizer rate significantly improved biomass yield barley at Holetta and Robgebeya. This revealed the easy release of nutrients from NP fertilizer as compared to organic fertilizer sources. Integrated soil fertility management involving the judicious use of combinations of organic and inorganic resources is a feasible approach to overcome soil fertility constraints and contribute high crop productivity in agriculture [21]. Yearly performance variation of biomass yield was obtained between the two cropping seasons, which might be due to the environmental variation and soil fertility status of the two farms since different farm fields were used in two cropping seasons. The result was in agreement with Kassu et al. [32].

The mean harvest index of barley was significantly () affected with the integrated use of NP fertilizer and organic fertilizer sources. The mean harvest index of barley was ranged from 39 to 48% (Table 3). Significantly higher mean harvest index of barley was obtained from 50 :50% vermicompost with conventional compost followed by conventional compost application. Similar result was found by Chakrawarty [28, 39, 47]. Likewise, Woubshet et al. [27] reported that harvest indices of barley ranged from 37 to 47% and showed significantly an increasing trend with increased combination of applied lime, organic and blended inorganic fertilizers in acid affected soil of Wolmera district. This might be due to increase of nutrient efficiency and supplying different available nutrients which more partitioned to grain when organic fertilizer sources are applied. Similarly, Woubshet et al. [27] stated that the application of lime with increased rate of compost and inorganic fertilizers might have increased the efficiency of barley to partition the dry matter to the seed.

3.4. Integrated Use of NP Fertilizer and Organic Fertilizer Sources on Economic Profitability of Barley Production

The value to cost ratio for NP fertilizer and organic fertilizer sources was 9.80 to 19.78 EB per unit of investment (Table 4). Correspondingly, the application of 1 : 1 compost : mineral fertilizer could enable farmers to earn a return of US$7.57 for every US$1.0 investment, which implied high profitability of malt barley due to integration of the locally available organic materials with mineral fertilizers [32]. Barley production with application of 50 : 50% conventional compost with NP fertilizer gave net profit advantage of 25,484 EB with marginal rate return of 56% followed by 50 :50% vermicompost with NP fertilizer, and conventional compost gave net benefit of 25,414 and 25,356 EB·ha⁻¹ with marginal rate return of 50 and 972% (Table 4). Tariku [39] reported that the highest net benefit of EB 58553 ha⁻¹ and marginal rate of return 36.45% of barley was obtained from the application of 66.6 : 33.4% NPS : FYM followed by EB 57781 ha⁻¹ and marginal rate of return 2153% of barley gained from the application of 100% NPS (Table 4). Similarly, Mitiku et al. [28] also reported that the application of 5 t·ha⁻¹ FYM + 75% inorganic NP gave the highest net return with 15,859 EB·ha⁻¹ at Adiyo and 13,108 EB·ha⁻¹ at Ghimbo. Likewise, Woubshet et al. [27] reported that the application of lime integrated with compost and blended fertilizer (NPSB) indicated the highest net return of EB 30633 with highest marginal rate return of 667% with values to cost ratio of EB 5.49 profit per unit investment for barley production in Wolmera district. The highest marginal rate of return of 980% was obtained with the application of 50 : 50% farmyard manure: with recommended NP for barley production (Table 4). The economic analyses confirmed that barley production with the application of 50 : 50% conventional compost with NP fertilizer or 50 : 50% vermicompost with NP fertilizer was profitable for Chelia highlands.

4. Conclusion

The integrated use of inorganic NP with organic fertilizer sources significantly improved yield and yield components of barley. Yield and yield components of barley were significantly influenced by cropping seasons indicating variation of climatic factors across different seasons, which may have been the results of temperature and rainfall distribution occurred during growing season. Significantly higher grain yield of barley was obtained from integration of 50 : 50% vermicompost and conventional compost based on N equivalence with recommended NP fertilizer application. The application of 50 : 50% conventional compost with NP fertilizer gave net profit advantage of 25,484 EB with marginal rate return of 56% followed by 50 : 50% vermicompost with NP fertilizer and conventional compost gave net benefit of 25,414 and 25,356 EB·ha⁻¹ with marginal rate return of 50 and 972%. Therefore, the application of 50 : 50% conventional compost and vermicompost based on N equivalence with recommended NP fertilizer rate was recommended for optimum grain yield and economical profitable barley production in Chelia district, West Showa, Ethiopia.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Acknowledgments

The authors thank Natural Resources Management Research Process for funding the experiment. The authors are very grateful to Ambo Agricultural Research Center Management for providing all necessary equipments and logistics during the research work. All the technical and field assistants of Natural Resources Management Research Process are also acknowledged for unreserved effort during executing the experiment. The authors also thank Chelia district farmers for providing them land for field research work and also for their assistance in field management.

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Copyright © 2018 Tolera Abera et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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International Journal of Agronomy

Effect of Integrated Inorganic and Organic Fertilizers on Yield and Yield Components of Barley in Liben Jawi District

Abstract

1. Introduction

2. Materials and Methods

3. Results and Discussion

3.1. Plant Height, Spike Length, and Total Number of Tillers Plant−1 of Barley

3.2. Grain Yield and Thousand Seed Weight of Barley

3.3. Biomass Yield and Harvest Index of Barley

3.4. Integrated Use of NP Fertilizer and Organic Fertilizer Sources on Economic Profitability of Barley Production

4. Conclusion

Data Availability

Conflicts of Interest

Acknowledgments

References

Copyright

3.1. Plant Height, Spike Length, and Total Number of Tillers Plant⁻¹ of Barley