【摘要】 采用田间试验,对强化栽培(SRI)和常规水作(TF)二种栽培方式以及氮肥用量对水稻产量、水分生产效率及稻田土壤氨挥发的影响进行了研究。结果表明,在不同施氮量条件下,强化栽培产量均高于常规水作,平均提高了24.1%。整个生育期强化栽培节约灌溉水830.3mm,提高了水分生产效率。不同施肥期两种栽培方式土壤氨挥发损失以基肥最高、分蘖肥次之,孕穗肥最低。强化栽培氨挥发损失总量平均提高25.2%。更多还原

【Abstract】 Field experiments were conducted in 2006 to investigate effects of SRI on rice yield, water productivity and NH3 volatilization from soil with different N application rates. Grain yield under SRI was higher than traditional flooding, regardless of amount of N fertilizer application. Average grain yield was increased by 24.1% with reducing irrigation water 830.3 mm, and SRI increased the water productivity. The greatest NH3 volatilization loss took place when urea applied at the basal stage, the intermediate loss at the tillering stage, and the smallest at the booting stage. Average NH3 loss by volatilization accounted for 5.7% under SRI and 4.9% under TF, respectively, and total amount of NH3 loss increased by 25.2% with SRI.更多还原