论文部分内容阅读
(1)稻田轮种棉花期间,土壤有机质含量有减低的趋势,但土壤代换性盐基总量及速效磷的合量均增高。轮种水稻期间,土壤有机质又有增加的趋向,而代换性盐基总量及速效磷则渐次减低。此外,土壤中铵态氮则有增多的趋势。(2)稻棉轮种能增强水稻的生长势,提高水稻的产量。根据对比试验及统计资料,一般比连种区增产9%左右。(3)稻田轮种棉花后,冬作绿肥生长良好, 鲜草产量比一般连种稻田增加70%以上。(4)在保证增产的前提下,轮种区的水稻基肥用量,一般可比连作稻区节省40%左右,而轮种区的绿肥产量又能增加,因此可自轮种田内割出60%的绿肥鲜草,作为其他稻田的基肥,而达到全面增产的目的,这在目前肥料普遍不足的情况下有其重要意义。
(1) Soil organic matter content tends to decrease during the cotton rotation in paddy fields, but the total amount of soil replacement base and available phosphorus are increased. Soil organic matter tended to increase during the rotation of paddy rice, while the total amount of alternative base and available phosphorus decreased gradually. In addition, the ammonium nitrogen in soil tends to increase. (2) Rice varieties can enhance the growth potential of rice and increase the yield of rice. According to comparative tests and statistical data, the yield is generally about 9% higher than that of even species areas. (3) Winter paddy green manure grows well after cotton is planted in paddy fields, and the yield of fresh grass is increased by more than 70% compared with that of even paddy rice. (4) Under the premise of ensuring the increase of production, the amount of rice-based fertilizer used in the rotation areas can generally save about 40% of the rice production compared with continuous cropping and the green manure yield in the rotation areas can increase so that 60% Green fresh grass, as the base of other rice paddy, and to achieve the purpose of full production, which in the current general lack of fertilizer has its significance.