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青干和干热风是我区小麦生育期间的主要自然灾害,一般年份可使小麦减产5～10％,严重年份可达20％以上。因此,研究“青干”及“干热风”的发生规律、预防措施及其理论根据,对保证小麦高产、稳产具有重要意义。一、一九七七年气象条件对小麦生育影响及青干、干热风发生情况分析一九七七年小麦生育期间气象条件的主要特点是: 1.四月下旬至六月上旬严重低温寡照;
Dry and dry hot air is the main natural disasters during the growth of wheat in our district. In general, the wheat yield can be reduced by 5-10% and the severe year by more than 20%. Therefore, it is of great significance to study the occurrence rules, preventive measures and theoretical basis of “green stem” and “dry hot wind” to ensure high yield and stable yield of wheat. I. THE INFLUENCES OF METEOROLOGICAL CONDITIONS ON TROPHY OF WHEAT IN 1977 AND THEIR INFLUENCE ON THE SPRING AND DRYING OF THE WHEAT The main features of the weather conditions in 1977 during wheat growth are: 1. Severe low-temperature oligo-images from late April to early June;