Greenhouse Gas Emissions from Cotton Field under Different Irrigation Methods and Fertilization Regimes in Arid Northwestern China

Table 2

Effects of different irrigation methods and fertilization regimes on major soil characteristics. Values are means ± standard deviation of three replicates. Different small letters in the same column refer to significant difference between treatments at 𝑃<0.05 level.

	Seedling stage	Bud stage	Flowering and boll-forming stage	Boll opening stage
Soil moisture (%)
FC	16.79 ± 0.37b	18.63 ± 0.25a	20.46 ± 1.04a	16.00 ± 1.25b
DC	17.28 ± 0.05b	12.24 ± 0.13c	19.79 ± 1.00a	18.81 ± 1.13a
FB	18.19 ± 0.35ab	18.92 ± 0.35a	19.52 ± 0.85a	14.16 ± 1.50b
DB	19.65 ± 0.71a	14.93 ± 0.69b	23.11 ± 0.82a	18.70 ± 1.56a
Soil temperature (°C)
FC	24.01 ± 0.33a	24.55 ± 0.12b	21.2 ± 0.12b	18.53 ± 0.10a
DC	23.98 ± 0.12a	26.29 ± 0.25a	22.55 ± 0.15a	18.29 ± 0.27a
FB	24.28 ± 0.19a	24.41 ± 0.36b	21.78 ± 0.37ab	18.03 ± 0.37a
DB	23.92 ± 0.09a	25.80 ± 0.37a	22.11 ± 0.33ab	18.00 ± 0.05a
Soil NO3^−-N (mg kg^−1)
FC	100.82 ± 4.03a	145.82 ± 3.52a	56.38 ± 6.68b	26.94 ± 4.18a
DC	108.44 ± 3.39a	19.80 ± 1.44b	46.11 ± 1.29b	38.77 ± 5.15a
FB	98.24 ± 6.86a	155.94 ± 12.38a	76.94 ± 2.49a	37.26 ± 0.12a
DB	104.75 ± 5.31a	25.54 ± 0.80b	41.13 ± 4.90b	39.19 ± 6.45a
Soil NO4^+-N (mg kg^−1)
FC	2.14 ± 0.28a	1.98 ± 0.41ab	1.38 ± 0.19a	0.46 ± 0.08a
DC	2.14 ± 0.21a	1.07 ± 0.13b	0.96 ± 0.01a	0.36 ± 0.08a
FB	2.17 ± 0.05a	2.29 ± 0.16a	1.24 ± 0.24a	0.34 ± 0.05a
DB	2.04 ± 0.11a	1.29 ± 0.06b	1.01 ± 0.12a	0.57 ± 0.16a