摘要
选用美国先锋公司的4个比良玉米杂交种,以当地主栽品种丹玉13为对照进行连续3年的试验研究。结果表明,先锋公司的78599等是高产、稳产、抗旱的杂交种。对不同杂交种在干旱年份与正常年份表现的比较结果表明,不抗旱的杂交种在旱年是由于穗粒数和粒重降低而导致产量下降。在开花至成熟期发生干旱,所有杂交种的叶面积指数(LAI)衰减率都上升,生物产量下降。但抗旱杂交种可通过推迟LAI开始衰减的时期,减缓LAI衰减率和提高经济系数等保持产量的稳定性。
Four corn hybrids provided by Pioneer Corp.were involved and DY13 was used as control in our three year experiments. The results showed that 4 hybrids from Pioneer (78599, 6JK108, 78613 and 6JK111) were drought resistant and with high and stable yield. The comparison of the hybrid performances in drought year (1989) with those in normal years (1987—1988)indicates that the yield reduction of drought sensible hybrid in drought year was due to the reduction of kernels per ear and 100-kernel weight. When drought occured in the stage from flowering to maturing, the LAI reduction rate increased and biomass decreased in all hybrids, but drought resistant hybrids maintained high grain yield by means of delaying the beginning time of LAI reduction, slowing LAI reduction rate and increasing the harvest index.
出处
《沈阳农业大学学报》
CAS
CSCD
1991年第1期21-26,共6页
Journal of Shenyang Agricultural University
