Dry Matter Accumulation and Nutrient Uptake by Wheat (Triticum aestivum L.) under Poplar (Populus deltoides) Based Agroforestry System

Table 4

Nutrients uptake (kg ha⁻¹) by wheat crop at harvest at different distances from poplar tree line.

Distance from tree line (m)	Nutrient uptake (kg ha^−1)
	N	P	K	N	P	K	N	P	K	N	P	K
				3 years						4 years
		Grain			Straw			Grain			Straw
0–3	47.2	7.6	11.2	28.3	3.1	75.9	41.8	6.5	10.6	28.4	2.5	71.5
3–6	57.9	7.5	13.0	39.2	3.2	101.7	50.7	8.7	12.7	39.7	2.2	87.9
6–9	56.2	7.7	13.5	38.5	3.4	97.6	55.7	7.8	13.9	38.7	3.3	112.2
9–12	54.3	6.5	13.1	34.6	2.1	88.6	51.7	8.4	12.0	33.0	2.8	95.7
12–15	57.5	8.9	13.7	34.3	2.5	83.3	55.2	8.9	11.4	33.0	2.4	84.1
Control^*	56.8	8.7	13.2	34.6	2.6	84.6	57.0	7.6	12.9	35.0	2.7	87.4

^*Recorded 15 m away from tree line.