自然降水量利用与旱地裸燕麦产量形成的关系

通过该项调查与分析表明 :旱作区裸燕麦年平均降水量 30 0 - 40 0 mm,6- 8月降水量占全年的 64% - 74% ,降水变率小 ,降水日数多 ,大于 1 0和 2 5 mm降水次数多 ,1天或者 1小时内降水强度小 ,全年超过 30 0 mm降水保证率达 80 % ,生长季节内超过 2 5 0 mm占 70 % ,7-8月超中均出现丰、平、欠年规律 ;4、5、6月降水量大于 1 0、2 5、5 0 mm,7和 8月大于 1 0 0 mm。或者有两次 1 0 mm的保苗雨 ,40 - 60 mm的抽穗雨 ,1 0 0 mm的灌浆雨 ,亩产达 5 1 - 74kg。反之 ,2 0- 30 kg通过蓄住天上水 ,保住地里摘 ,形成土壤小水库的耕作措施 ;合理调节播种期 ;搭配不同熟性品种 ,增强抗旱性和经济性状 ,达到持续丰产和稳产目的。

Natural Precipitation and Yield Formation of Naked Oat in Rainfed Farming Areas

The relationship between natural precipitation and yield of naked oat in rainfed farming areas was investigated during 1984~1985. It was found that 250mm of rain-fall (64~67% of the annual )was the minimum requirement for a high yield of 765~1110kg/km 2 if two rainfalls of 10min in seedling stage. Otherwise, an avevage yield of 300~450 kg/km 2 was abtained. By selecting suitable variety, adjcesting sowing date and other cultavation measures, restainable high yields are available in the dryland farming areas.