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冀单15号玉米单交种于80年代中期引进我县,表现品质好,抗逆性强,产量高,现已成为我县主栽品种。但近三年来,群众反映和调查发现,果穗秃尖严重,直接影响了产量和经济效益。这种现象并非该品种的本性,而是因其产量高,需肥量大,加之它是麦茬接种,大都不施用底肥,只施用化肥,因肥效短,后期脱肥,致使减弱了籽粒灌浆速度,饱满度差。尤其穗顶部籽粒建成很困难,导致果穗秃尖严重,品质差,并降低了产量。为证实这个问题,我们于1991年对该品种进行了追施花粒肥试验。分四个处理,即亩追施尿素7.5公斤、5公斤、2.5
Hebei single No. 15 corn single cross into the county in the mid-80s, the performance of good quality, strong resistance, high yield, has now become the main cultivated varieties in our county. However, in the recent three years, the masses responded and the survey found that the spikes of the ears are serious and directly affect the output and economic benefits. This phenomenon is not the nature of the species, but because of its high yield, the need for large amount of fertilizer, coupled with it is inoculated wheat stubble, most do not apply base fertilizer, only the application of fertilizer, due to short efficiency, post-fattening, resulting in weakened grain filling rate Fullness is poor. In particular, the top of the spike grain is difficult to build, resulting in severe bald tip, poor quality and reduced yield. In order to confirm this problem, we conducted a top-dressing experiment on this variety in 1991. Divided into four treatment, namely, the top dressing of urea 7.5 kg, 5 kg, 2.5