论文部分内容阅读
本文通过不同水型水稻土水稻施钾效果的研究,结果表明,潜育型水稻土>潴育型水稻土>淹育型水稻土。水稻施钾能增强根系氧化力,提高土壤氧化还原电位的百分比和降低土壤还原物质含量,以及增加土壤好气性细菌和降低反硝化细菌的百分比等作用,均为潜育型水稻土>潴育型水稻土>淹育型水稻土;水稻生长季节的水、土温度,土壤供钾能力和水稻吸收土壤钾素的量为淹育型水稻土>潴育型水稻土>潜育型水稻土。而水稻吸收肥料钾占总吸钾量的比,则为潜育型水稻土>潴育型水稻土>淹育型水稻土。并找出了淹育型水稻土、潴育型水稻土和潜育型水稻土水稻施钾有效的土壤速效钾含量临界值,分别为54、82和141mg kg~(-1)。本文还提出了不同水型水稻土在不同土壤速效钾水平下,水稻最高产量和最经济产量的施钾量,以及钾肥的适宜施用期,为合理施用钾肥提供了科学依据。
In this paper, different types of paddy soil rice paddy effect study showed that the potential of paddy soil> pool type paddy soil> flooded paddy soil. Potassium application in rice could enhance the root oxidation, increase the redox potential of soil, decrease the content of soil reducing substance, increase the amount of aerobic bacteria in soil and decrease the percentage of denitrifying bacteria. Paddy soil> flooded paddy soil; water and soil temperature, soil potassium supply capacity and K content of paddy soil in paddy growing season were flooded paddy soil> water-retention paddy soil> latent-type paddy soil. However, the ratio of potassium uptake by rice to total potassium uptake was that of paddy-paddy soil> reed-type paddy soil> flooded paddy soil. The critical value of soil available K content in paddy soils paddy soil, paddy soil and paddy soil were found, which were 54, 82 and 141 mg kg ~ (-1), respectively. This paper also proposed different potassium paddy soil at different soil available potassium levels, the highest yield and the most economical yield of rice, as well as the appropriate potash application period, to provide a scientific basis for the rational application of potassium.