不同土层厚度条件下旱地小麦花后根系干重及产量变化

Changes of dry weight of root system after anthesis and yield in different soil thickness in dryland wheat

用土柱栽培法研究了不同土层厚度条件下旱地小麦花后根系干重及产量变化 ,结果表明 :土层厚有利于旱地小麦根系生长 ,根系分布于表层的比例少 ;土层愈薄 ,籽粒产量中来自开花前贮藏器官物质运转的量所占的比例就愈高 ,产量愈低。由于处理 3(1 60 cm)与处理 4(对照 ,2 0 0 cm)差异不显著 ,处理 1 (80 cm)、2 (1 2 0 cm)与处理 4(对照 )差异显著 ,因此可以认为旱地小麦获得高产的土层厚度下限指标应在 1 60 cm左右 ,并可据此制定管理方案 。

The changes of dry weight of root system after anthesis and yield in different soil thickness have been studied in dry land wheat. The results are as follows: The thicker the soil is, the more beneficial the result is to the root system growth of wheat and the lower the ratio of root system distributing in upper levels is. While the thinner the soil is, the higher the ratio of grain yieid coming from the store organ transported before anthesis is, and the lower the grain yield is. There is no significant difference between treatment 3(160 cm) and treatment 4(control, 200 cm),and there is significant between treatment 1(80 cm) and treatment 2(120 cm) and treatment 4(control,200 cm). So treatment 3(160 cm) can be chosen as minimum index for gaining higher yield, and as the basis for taking administration programme to obtain high yield and high efficiency in dry land wheat.