问题
问答题 简答题
小麦倒伏的原因及预防?
答案
参考答案:
小麦倒伏主要原因有:一是品种选择不当,秸秆过高,抗倒伏能力差;二是种植密度过大,个体发育不好;三是前期肥水过大,群体大,旺长,“头重脚轻”,极易倒伏;四是后期浇水不当,一遇风雨易造成倒伏。
预防小麦倒伏,最根本的方法是:选用矮杆、抗倒品种;合理密植培育壮苗;科学运用肥水,创造合理群体结构,改善通风透光条件以及后期浇水要适时、适量。
小麦倒伏的原因及预防?
参考答案:
小麦倒伏主要原因有:一是品种选择不当,秸秆过高,抗倒伏能力差;二是种植密度过大,个体发育不好;三是前期肥水过大,群体大,旺长,“头重脚轻”,极易倒伏;四是后期浇水不当,一遇风雨易造成倒伏。
预防小麦倒伏,最根本的方法是:选用矮杆、抗倒品种;合理密植培育壮苗;科学运用肥水,创造合理群体结构,改善通风透光条件以及后期浇水要适时、适量。
用方框内所给短语的适当形式填空。 | |
2. Lucy's mother is ill, so Lucy ___________ babysit her younger sister. 3. ___________ to my home at 6. We can discuss the project together. 4. Don't ___________ him. He'll get well soon. 5. Susan is smart and she ___________ math. 6. —___________ do you live from school? —Three miles. 7. —What's Julie doing? —She ___________ the math test at home. The exam is coming. 8. Nancy ___________ Shanghai last week. She is coming back tomorrow. 9. Although we are twins, we have nothing ___________. 10. —What does he ___________ the film? —He thinks it's funny. |