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水旱轮作使土壤环境得到更新,已被大量试验研究证实具有显著的增产效果。但不同的轮作年限土壤的性状改善及增产的效果是不同的。研讨水旱轮作的周期性,因地制宜确定合理轮作年限,是推行水旱轮作必须解决的重大问题。现根据我们掌握的调查材料,就这个问题谈一点看法。 1.从作物产量的变化看其周期性。作物产量是水旱轮作效果的直接体现,其变化趋势反映了轮作的周期性。 重壤土。据县农业局棉油股1981在曹市庙弯大队对水改旱2—6年棉花亩产量的
The rotation of soil and water to make the soil environment updated has been confirmed by a large number of experiments with significant stimulation effects. However, the effect of soil improvement and yield increase is different in different rotation years. Studying the cyclical nature of flood and drought rotations and determining the reasonable rotation years according to local conditions are major issues that must be solved in implementing flood and drought rotation. Now based on the survey materials we have, let’s talk about this issue. 1. See the cyclical changes in crop yields. Crop yield is the direct manifestation of the effect of rotation and precipitation, and its changing trend reflects the periodicity of rotation. Heavy loam. According to the County Bureau of Agriculture Cottonseed Unit 1981 in Cao City Temple bend brigade on the water to drought 2-6 years cotton mu production