小麦拔节期冻害补救措施对产量及其构成的影响

江苏里下河地区小麦拔节孕穗期常遭遇低温寒潮,造成小麦冻害,影响小麦生产。本试验针对生产上小麦拔节期前后发生冻害的实际情况,采取不同施肥量和肥料运筹等补救措施,以期阐明小麦拔节期遭遇冻害后应对措施。结果表明,对于小麦已拔节且施过拔节孕穗肥的田块,以冻害后施复合肥690 kg/hm2^{保产效果最好},其次为冻害后施尿素75 kg/hm2 +10天后追施尿素75 kg/hm2^{。对于未拔节}且未施拔节孕穗肥田块,以一次性施复合肥225 kg/hm2⁺尿素225 kg/hm2^{产量最高。}

Effects of Salvage Measure on Yield and Composition of Wheat at Jointing Stage induced to Cold damage

Low temperature and cold damage are often encountered in the jointing booting stage of wheat in Lixihe area of Jiangsu province, which causes freezing damage to wheat and affects wheat production. According to the actual situation of frost damage before and after jointing stage of wheat, the experiment adopted different fertilizer application, in order to clarify the countermeasures after freezing damage of wheat at the jointing stage. The results showed that 690 kg/hm² compound fertilizer was the best yield guarantee after wheat freezing damage, followed by 75 kg/hm2 ^{urea +10 days later 75 kg/hm2} urea was applied. For the non-jointing and non-jointing fertilized plots, the highest yield was obtained by applying 225 kg/hm2 ^{compound fertilizer and 225 kg/hm}2 ^urea.