玉米杂交种氮效率遗传相关与通径分析

玉米过量施用氮肥可导致经济效益下降和硝酸盐向地下水淋失,因而受到人们越来越多的重视.选育氮高效杂交种可以降低生产成本和减少环境污染.本试验选用8个玉米杂交种,在高氮(纯N 200 kg/hm²)、低氮(不施氮)条件下分析了农艺性状决定氮效率高低的作用.结果表明:在氮高效杂交种选育中,高氮条件下选育高产品种,应注意对穗行数、行粒数、百粒重、吐丝期生物量、穗三叶面积的选择,而对其它性状的要求放宽;低氮条件下选育耐低氮的高效品种,更应注重选择大穗型、穗行数多,且有较大成熟期生物量、大的穗三叶叶面积的品种。

Genetic Correlation and Path Analysis of Nitrogen Use Efficiency of Maize Hybrids

Overdose of nitrogen (N) fertilizer may cause not only less economic benefit, but also more nitrate leaching into groundwater, therefore, catches more attention than anytime before Nitrogen efficient maize cultivars provide a promising way to solve the problem In this experiment, eight hybrids were used to analyze agronomic characters in relation to N use efficiency (grain yield / N supplied) under high (200 kg N/hm 2), and low (no N) N levels It was suggested that, for selecting high yielding hybrids under high N supply, grain rows per ear, grain number per row on the ear, grain weight, biomass at silking stage, and the total area of the three leaves near the ear can be taken as selection indices For selecting N-efficient hybrid under low N supply, such characters as big ear weight, more grain rows per ear, big biomass at maturity and big area of the three leaves near the ear should be taken into consideration