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首页> 外文期刊>Sustainable Agriculture Research >Timed Strategy for Control of Bollworm for Sustainable Sorghum Crop Yield under Varied Regimes of Rainfall, Temperature and Soil Fertility
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Timed Strategy for Control of Bollworm for Sustainable Sorghum Crop Yield under Varied Regimes of Rainfall, Temperature and Soil Fertility

机译：降雨，温度和土壤肥力变化条件下棉铃虫可持续高粱产量的定时控制策略

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摘要

Various environmental factors influence yield of sorghum grain, Sorghum bicolor (L) in Sub-Sahara Africa. Various production conditions of rainfall amount, temperature regimes, soil fertility levels and bollworm Helicoverpa armigera density at specific sorghum grain stage were evaluated for effect to sorghum grain yield. High rainfall amount, high temperature and soil fertility levels were positively correlated to sorghum grain yield at three test sites at Ithookwe, Katumani and Kampi of eastern Kenya. The warmest Kampi site achieved the highest seed viability on germination test at 43, 87 and 99% for grain stage of light-green, cream-dough and hard dough, respectively. High H. armigera density was inversely correlated to grain yield. Comparatively, yield loss of 35% as the grain ripened to early hard dough stage. Thus initial H. armigera damage occurred at late soft dough stage and increased exponentially as the grain ripened to early hard dough stage. The right time to spray against H. armigera was determined as at soft dough stage of sorghum grain to prevent economic damage of the crop. Thus fertility level, rainfall amount and time of bollworm pest attack were deemed worth considerations towards sustainable yield of sorghum.
机译：各种环境因素都会影响撒哈拉以南非洲地区高粱（双色高粱）的产量。评价了特定高粱粒期的降雨量，温度制度，土壤肥力水平和棉铃虫棉铃虫密度的各种生产条件对高粱产量的影响。在肯尼亚东部伊瑟库威，卡塔塔尼和坎皮的三个试验地点，高降雨量，高温和土壤肥力水平与高粱籽粒产量成正相关。在发芽试验中，最温暖的甘pi地区在浅绿色，奶油面团和硬面团的发芽阶段分别达到了43％，87％和99％的最高种子活力。棉铃虫高密度与谷物产量成反比。比较而言，随着谷物成熟到早期硬面团阶段，产量损失降低了35％。因此，最初的棉铃虫损害发生在软面团后期，并且随着谷物成熟到硬面团早期而呈指数级增长。在高粱籽粒的软面团阶段确定了正确的喷施棉铃虫的时间，以防止对农作物造成经济损失。因此，认为bo虫害的肥力水平，降雨量和侵袭时间对于高粱的可持续产量值得考虑。

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