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我县长港一带平原湖区年年都有一定面积棉苗发生不同程度的迟发现象。迟发棉花就会因生长发育赶不上光热最优季节而减产。在春季寒流频繁,气温多变的年份,迟发面积多达70％以上。迟发严重的棉田,甚至完全错过季节,只好翻耕改种。为了研究解决这一问题;我们从1976年以来对旭光公社、东沟公社、县棉花原种场及我所的55个小队,15,000余亩迟发棉田进行了调查和试验研究,现将结果报道如下。 一、棉苗迟发的主要原因 1.土质差,地下水位高 长港一带平原湖区棉田的土壤多系长江携带来的泥沙经静水沉积而成。所以,质地多为粘性,物理性状较差。有的棉田土壤一犁土以下处于还原状态,有机质得不到充分分解,再加上长期不良耕作,以致形成僵土。同时,由于地势较低,地下水位高,沟
My long area along the plains of Lake District plain cotton area has a certain area of cotton seedlings delayed to varying degrees. Late cotton will be due to growth and development can not keep up the optimal season of light and heat production and cut. Cold frequent in the spring, changing temperatures in the year, late area as much as 70%. Delayed serious cotton fields, or even completely missed the season, had to change the plow. In order to study and solve this problem, we conducted a survey and experimental study on the original cotton fields of Xuguang commune, Donggou commune and county cotton fields, and our 55 sub-teams and more than 15,000 late-season cotton fields since 1976. Now we report the results as follows. First, the main reason for delayed cotton seed 1. poor soil quality, high groundwater level in the vicinity of Changgang in the plain cotton area of the cotton fields of the Yangtze River sediment transported by hydrostatic sedimentation. Therefore, the texture is mostly sticky, poor physical properties. In some cotton fields, the soil below the plowed soil is in a reduced state, and the organic matter can not be fully decomposed. Coupled with the long-term bad farming, the soil becomes stiff. At the same time, due to the lower ground, groundwater level is high, ditch