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1.在南京低丘地区,发育于黄土性母质上的轻度潴育性水稻土,在水旱连作的栽培制度下,本田耕地,通过干耕晒垡过程,并无效果。2.本文对不同类型水稻土干燥后的铵态氮动态,进行了测定和讨论,认为对于还原性强烈而腐殖质较多的水稻田,干耕晒垡是发挥水田潜在地力的有效措施,且只有在土壤充分干燥情况下,才能加速土壤有机质的矿化过程,但是,对于一般腐殖质含量较低,而无显著沼泽化迹象的轻度潴育性水稻土,由于土壤氧化势较高,土壤本身对促进有机物的分解具有良好条件,在田间情况下,对于耕作上某一短期的土壤干燥过程,不易产生较为明显的效果是可能的。3.对于水稻生长期间,土壤中NH_4~+及NO_3~-的动能进行了初步分析和讨论,初步指出,在长江下游地区,水田肥力的发挥,可能在很大程度上有赖于对土壤矿化过程的促进。
1. In Nanjing hilly region, mildly eroding paddy soil developed on loess parent material under Horticultural cultivation system, Honda cultivated land, through drying drying sun drying process, no effect. In this paper, the dynamic changes of ammonium nitrogen after drying of different types of paddy soil were measured and discussed. It is concluded that dry paddy drying is an effective measure to harness the potential of paddy field for paddy fields with strong reducibility and high humus content, and only In the case of fully dry soil, mineralization of soil organic matter can be accelerated. However, for mildly eroding paddy soil with low humus content and no obvious signs of swamping, due to the higher soil oxidation potential, Promote the decomposition of organic matter with good conditions, in the field case, for farming on a short-term soil drying process, not easy to produce more obvious effects are possible. The kinetic energy of NH_4 ~ + and NO_3 ~ in soils during the growth of rice was primarily analyzed and discussed. It is initially pointed out that in the lower reaches of the Yangtze River, the fertility of paddy fields may depend largely on the mineralization of soil The process of promotion.