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人们运用淹水栽稻的方法,是有无可争辩的优点的。非常明显水稻土在水层复盖下土温可以少受气候的影响,能较长期地保持稳定少变,因而有利于腐殖质的合成和微生物的活动,从而导致土壤供肥力的充分发挥。同时利用水田蓄水,还可以少受旱灾威胁,减少洪涝影响,调节大气湿度。在一些地区,利用水田种稻,还可改良盐土,增产粮食。但是淹水栽稻确实也存在着一些缺点,例如,它在长期淹水的情况下土温不易提高,还原作用旺盛,易产生有毒物质,妨碍水稻生长(特别在排水不良的地方,更易引起年年坐蔸)。在当前提高水稻产量与人口增长之间,以及改良
It is indisputable that people use the method of flooding rice. It is obvious that the soil temperature of paddy soil covered by water layer can be less affected by climate and can maintain stable and changeable over a long period of time, which is conducive to the synthesis of humus and the activity of microorganisms, resulting in the full fertilization of soil. At the same time using paddy field water storage, but also less threatened by drought, reduce the impact of floods, regulate atmospheric humidity. In some areas, the use of paddy rice, but also improve salt, increase grain production. However, flooding rice does have some drawbacks. For example, it is not easy to increase the temperature of soil under long-term flooding, and the reduction effect is strong. It is easy to produce toxic substances and hinder the growth of rice (especially in poorly drained areas, Years sitting 蔸). Between current increases in rice production and population growth, as well as improvements