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稻田土壤通透性能好坏,直接影响到土壤物理、化学性质和微生物区系与活性,也影响到农业技术措施的贯彻执行。具有良好通透性的稻田土体,能适当加大田间渗漏量,有利于土壤气体的更新,提高氧化还原电位,降低或消除还原性有毒物质的为害,调节水、肥、气、热的适度比例;水稻移栽后,返青快、分蘖早,能有效地进行促控,水稻根系活力提高,吸收养分能力增强,中后期稳健生长,不早衰,是水稻获得高产必不可少的条件。但是,云南稻田土壤一般通透性能不良,尤其是胶泥田类型更差。下面,分别就其形成原因以及不同肥力稻田土壤通透性能指标和调节措施作初步探讨。
Paddy soil permeability is good or bad, directly affects the soil physical, chemical properties and microbial flora and activity, but also affect the implementation of agricultural technical measures. Paddy soil with good permeability can increase the amount of leakage in the field, which is beneficial to the renewal of soil gas, increase the oxidation-reduction potential, reduce or eliminate the damage of reducing toxic substances, and regulate the water, fertilizer, gas and heat Moderately proportioned. After transplanting rice, returning to green quickly and early tillering could effectively promote and control rice root activity to enhance the ability to absorb nutrients increased in the late stable growth, premature aging is indispensable to obtain high yield of rice. However, the general permeability of paddy soils in Yunnan is poor, especially in the case of mastic fields. In the following, the causes of formation and the permeability index and adjustment measures of paddy soils with different fertility were discussed respectively.