Growth and yield compensation in sorghum (Sorghum bicolor L. Moench) as a function of planting density and nitrogen fertilizer in semi-arid areas of northeastern Ethiopia
Growth and yield compensation in sorghum (Sorghum bicolor L. Moench) as a function of planting density and nitrogen fertilizer in semi-arid areas of northeastern Ethiopia
复制标题
埃塞俄比亚东北部半干旱地区高粱（Sorghum bicolor L. Moench）的生长和产量补偿与种植密度和氮肥的关系
DOI：
10.1080/02571862.2005.10634685
复制
发表时间：
2005
影响因子：
0.9
通讯作者：
P. Hammes
中科院分区：
文献类型：
--
作者：
W. Bayu;N. Rethman;P. Hammes
在埃塞俄比亚东北部的两个地点进行试验，以确定群体密度对高粱生长、产量和氮利用效率的影响。Moench）在两个施氮水平下。采用随机完全区组设计，对8个处理进行了评价，这些处理包括两个氮肥水平（0和80 kg ha−1）和4个种群密度（166 666、88 888、38 095和29 629株ha−1）的析因组合，重复3次。结果表明，施氮显著提高了叶面积指数、干物质生产量、作物生长速率和籽粒产量。氮肥对产量构成因素也有积极影响。叶面积指数、作物生长速率（生长初期）和叶、茎、穗干物质生产量随密度的增加而增加。收获时谷物和秸秆产量随种群密度的增加而线性增加。单位面积的穗数和粒数是不同密度下籽粒产量变异的主要原因。可以得出结论，埃塞俄比亚东北部使用的常规种植密度（88 888株ha−1）不是最佳密度，因为谷物产量的增加在166 666株ha−1的群体密度下呈线性。因此，建议进一步研究以确定最佳种植密度。
An experiment was conducted at two locations in northeastern (NE) Ethiopia to determine the effect of population density on the growth, yield and nitrogen use efficiency of sorghum (Sorghum bicolor L. Moench) under two levels of nitrogen fertilizer application. Eight treatments, which consisted of factorial combinations of two N fertilizer levels (0 and 80 kg ha−1) and four population densities (166 666, 88 888, 38 095 and 29 629 plants ha−1), were evaluated in a randomised complete block design with three replications. The results indicated that nitrogen fertilizer significantly enhanced leaf area index, dry mass production, crop growth rate, and grain yields. Nitrogen fertilizer also positively affected yield components. Leaf area index, crop growth rate (at the early growth stages) and leaf, stem and panicle dry mass production increased as population density increased. Grain and stover yields at harvest increased in linear responses to increases in population density. Head and seed number per unit area accounted for most of the variation in grain yield at different plant densities. It can be concluded that the conventional planting density (88 888 plants ha−1), being used in NE Ethiopia is not the optimum density, as increases in grain yield were linear up to a population density of 166 666 plants ha−1. Thus, further study to determine the optimum planting density is recommended.