The cultivation of aerobic rice appears to be a potential option while mitigating threats of looming water scarcity for sustainable rice production. Although, severe prevalence of multi-flush weed pressure inhibiting nitrogen utilization for optimum grain yield becomes the crux of the problem for up-scaling this technology. Thus, the hypothesis of the study was that critical period of weed control (CPWC) governs nitrogen accumulation in aerobic soil—plant continuum, which appears to be the major determinant of ultimate grain yield in aerobic rice cultivation. With this view, the field studies were successively conducted in two locations at Panthnagar, Uttar Pradesh during 2015 and at Cuttack, Odisha during 2016 in India. Nitrogen utilization was estimated with varying magnitude of critical period of weed prevalence at 15 days interval since sowing till 75 days of crop growth. Results recorded significantly higher nitrogen uptakes of 106.6 and 106.0 kg ha⁻¹ while maintaining near weed-free situations during initial 75 days of crop growth at Panthnagar and Cuttack respectively, which were however comparable with similar situations maintained also at 60 and 45 days of crop growth in respective location. Consequently, stands at these situations produced comparable grain yield of 5.56 and 5.25 t ha⁻¹, 5.40 and 5.00 t ha⁻¹, and 5.15 and 4.70 t ha⁻¹ at corresponding locations, which were significantly higher than those corresponding weedy stands producing 1.35 and 0.90 t ha⁻¹, 1.48 and 1.10 t ha⁻¹, and 2.86 and 2.45 t ha⁻¹ grain yields in respective locations. Thus, higher nitrogen gains of 0.42 and 0.06%, and 0.31 and 0.03% were attributed to initial 75 and 60 days weed-free stands respectively at Panthnagar and Cuttack. While, nitrogen losses were maximum of 24.99 and 25.69%, and 24.26 and 24.85% at corresponding weedy crop stands; although, initial 15 day’s weedy crop stands or initial 45 days weed-free stands recorded the lowest nitrogen losses of 0.64 and 1.35%, and 1.51 and 2.16%, instead. Therefore, the study contributed above novel information explaining the dynamic correlation of nitrogen balance with prevalence and also magnitude of CPWC where N uptake culminated at 45 days weed-free situation ensuring optimum aerobic rice productivity.

有氧水稻的种植似乎是一种潜在的选择，同时减轻了迫在眉睫的水资源短缺对可持续稻米生产的威胁。虽然，多冲洗杂草压力的严重流行抑制了氮的利用，以实现最佳的谷物产量成为扩大该技术规模的问题的症结所在。因此，该研究的假设是，杂草控制的关键时期（CPWC）控制着好氧土壤-植物连续体中的氮积累，这似乎是有氧水稻栽培中最终谷物产量的主要决定因素。有鉴于此，实地研究于2015年在印度北方邦的Panthnagar和2016年在印度奥里萨邦的Cuttack的两个地点相继进行。自播种至作物生长75天后，每隔15天杂草流行的关键时期的变化幅度就估计了氮的利用。结果表明，氮摄入量显着提高，为106.6和106.0 kg公顷^-1分别在Panthnagar和Cuttack的作物生长的最初75天中保持接近无杂草的状况，然而，与在相应位置在60和45天的作物生长中保持相似的情况相类似。因此，停留在这些情况下产生的5.56和5.25吨公顷可比籽粒产量^-1，5.40和5.00吨公顷^-1，和5.15和4.70吨公顷^-1在对应的位置，这是显著大于相应产生1.35杂草看台更高和0.90吨公顷^-1，1.48至1.10吨公顷^-1，和2.86和2.45吨公顷^-1各个位置的谷物产量。因此，分别在Panthnagar和Cuttack的最初75天和60天的无杂草林分别获得了0.42％和0.06％以及0.31％和0.03％的更高的氮素收获。同时，相应杂草作物的氮素流失最大值分别为24.99％和25.69％，以及24.26％和24.85％。但是，最初15天的杂草作物林分或最初45天的无杂草林分的氮损失最低，分别为0.64和1.35％，以及1.51和2.16％。因此，这项研究提供了以上新颖的信息，解释了氮平衡与流行之间的动态关系，以及CPWC的数量，其中CP的吸收在45天无杂草的情况下达到了最高水平，从而确保了最佳的有氧水稻生产力。