丘陵旱地棉田的特点是地下水位低、排水良好、棉花发育早、不易从长郁闭,但土壤蓄水力差,遇到干旱很容易中途衰老,生长困难。因此在栽培措施上与平原灌区有根本的区别;即不是如何注意防止从长,而主要是防止老苗的问题。一、发生老苗的现象及原因由于丘障旱地不会造成土壤水分过多,因而地温较高,棉花苗期生育快,有利于争取多座伏前桃,但在现花后,棉花需要水分养分多的时候,却容易遇到伏旱,加以土壤保水力差,水分不足,根系发育和吸收能力都受到很大限制,棉株生长就发生困难。在这样情况下, Hilly dryland cotton field is characterized by low groundwater level, good drainage, early cotton development, not easy to long-closed, but poor soil water storage, drought is very easy to half-way aging, growth difficulties. Therefore, there is a fundamental difference between cultivation measures and plain irrigation areas; that is, not how to pay attention to preventing from growing but mainly to prevent the problem of young seedlings. First, the phenomenon and the reasons for the emergence of old seedlings Because the hilly dry land will not cause excessive soil moisture, so the ground temperature is higher, fast growth of cotton seedling, is conducive to fighting for more than volts, but in the current flower, cotton needs moisture More nutrients, but are prone to drought, to poor soil water retention, lack of water, root development and absorption capacity are subject to great constraints, cotton plant growth difficulties. Under such circumstances,