Effects of no-till and rice varieties on nitrogen and phosphorus balance in rice fields

Environmental Sciences Europe

Table 4 Residues and apparent balance of nitrogen in paddy soil

Time	Bulk density	Soil nitrogen storage	Nitrogen fertilizer	Nitrogen storage			B_RN	Soil nitrogen storage	B_TN
	Bulk density	Soil nitrogen storage	Nitrogen fertilizer	Soil	Grain	Straw	B_RN	Soil nitrogen storage
	g cm⁻³	kg N ha⁻¹
2016.06–2017.06
NTJ	1.215	4613.1 ± 6	250	4667.7 ± 10a	86.84 ± 2.1a	63.99 ± 3.6b	44.54 ± 5.1b	4679.9 ± 8a	32.35 ± 3c
NTG				4653.1 ± 11ab	83.24 ± 1.1b	67.99 ± 2.1a	58.78 ± 4.2a	4665.2 ± 10ab	46.58 ± 4b
CTJ				4654.1 ± 10ab	85.84 ± 2.0ab	62.08 ± 1.9b	61.04 ± 5.7a	4664.9 ± 5ab	50.24 ± 5ab
CTG				4646.8 ± 8b	79.15 ± 2.1b	66.25 ± 1.1ab	70.87 ± 4.9a	4659.0 ± 7b	58.68 ± 6a
2017.06–2018.06
NTJ	1.221	4679.9 ± 8a	250	4750.1 ± 9a	90.48 ± 3.6a	65.95 ± 3.1ab	23.36 ± 3.5c	4757.0 ± 8a	16.48 ± 1c
NTG	1.222	4665.2 ± 10ab		4726.1 ± 4bc	88.55 ± 4.2ab	70.30 ± 4.1a	30.38 ± 4.4b	4736.5 ± 5bc	19.96 ± 2b
CTJ	1.219	4664.9 ± 5ab		4727.7 ± 10bc	88.85 ± 1.8b	64.27 ± 3.1b	34.11 ± 3.8a	4737.0 ± 4b	24.79 ± 2a
CTG	1.220	4659.0 ± 7b		4715.5 ± 10c	82.28 ± 4.1c	68.96 ± 3.3a	42.29 ± 7.9a	4726.3 ± 6c	31.51 ± 4a

NTJ, NTG, CTJ, CTG indicate no-till/japonica rice, no-till/glutinous rice, conventional tillage/japonica rice, conventional tillage/glutinous rice, respectively. End of rice season: October 2016 and October 2017, end of winter fallow season: June 2017 and June 2018. B_RN: environmental loss of nitrogen in rice season; B_TN: annual environmental loss of nitrogen. Different lowercase letters in each column indicate significant differences set at p = 0.05 level