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Table 4 Residues and apparent balance of nitrogen in paddy soil

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

TimeBulk densitySoil nitrogen storageNitrogen fertilizerNitrogen storageBRNSoil nitrogen storageBTN
SoilGrainStraw
g cm−3kg N ha−1
2016.06–2017.06
 NTJ1.2154613.1 ± 62504667.7 ± 10a86.84 ± 2.1a63.99 ± 3.6b44.54 ± 5.1b4679.9 ± 8a32.35 ± 3c
 NTG4653.1 ± 11ab83.24 ± 1.1b67.99 ± 2.1a58.78 ± 4.2a4665.2 ± 10ab46.58 ± 4b
 CTJ4654.1 ± 10ab85.84 ± 2.0ab62.08 ± 1.9b61.04 ± 5.7a4664.9 ± 5ab50.24 ± 5ab
 CTG4646.8 ± 8b79.15 ± 2.1b66.25 ± 1.1ab70.87 ± 4.9a4659.0 ± 7b58.68 ± 6a
2017.06–2018.06
 NTJ1.2214679.9 ± 8a2504750.1 ± 9a90.48 ± 3.6a65.95 ± 3.1ab23.36 ± 3.5c4757.0 ± 8a16.48 ± 1c
 NTG1.2224665.2 ± 10ab4726.1 ± 4bc88.55 ± 4.2ab70.30 ± 4.1a30.38 ± 4.4b4736.5 ± 5bc19.96 ± 2b
 CTJ1.2194664.9 ± 5ab4727.7 ± 10bc88.85 ± 1.8b64.27 ± 3.1b34.11 ± 3.8a4737.0 ± 4b24.79 ± 2a
 CTG1.2204659.0 ± 7b4715.5 ± 10c82.28 ± 4.1c68.96 ± 3.3a42.29 ± 7.9a4726.3 ± 6c31.51 ± 4a
  1. 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. BRN: environmental loss of nitrogen in rice season; BTN: annual environmental loss of nitrogen. Different lowercase letters in each column indicate significant differences set at p = 0.05 level