摘要
不同的播期明显影响向日葵籽实产量及病害发生的程度。通过调整播期 ,可防止或减轻叶部斑病和菌核病的发生 ,在向日葵生产上起着很大作用。向日葵不同品种干物质积累规律符合Logistic生长曲线 ,可用方程 y =k/(1 +ae-bx)模拟。向日葵植株的器官平衡依次为 :除空壳外 ,茎秆 (2 8.5 % )、籽实 (2 4 .5 % )、叶片 (2 2 .5 % )、葵盘 (1 7.3 % )、叶柄 (4.9% )。土壤肥力对向日葵的器官平衡有较大影响。经济系数不高是向日葵的一个特点。栽培条件不同 ,经济系数差异较大。在一般情况下 ,春播条件下经济系数较高 。
Grain yield and occurance degree of disease in sunflower were obviously effected by seeding time. Leaf spot and sclerotium of sunflower were controlled with adjusting seeding time. Dry matter accumulation law of different sunflower hybrids conformed to Logistic growth curve; and was initated by y=k/(1+ae -bx)The organ balance of sunflower plants from big to small was culm (28.5%),grain (24.5%), leaves (22.5%), sunflower disc (17.3%), petiole (4.9%). The fertility of soil had a great influence on organ balance of sunflower. The economic coefficient was not high for sunflower and variant in response to cultural conditions. In general, the econonic coefficient for spring seeding was higher than that for summer seeding.
出处
《杂粮作物》
CAS
2002年第5期280-284,共5页
Rain Fed Crops
