摘要
本项研究通过连续十年的定位监测，较系统地分析了四川丘陵区稻、麦、油等作物，在多熟制条件下的养分吸收利用特点。明确不同稻型收获物的氮、磷、钾含量及氮素转比率、利用率、生产率主要受生殖生长阶段温光条件影响。同一作物而言，籽实、秸秆的氮、磷、钾含量，年际间及生育季节气候条件变化的影响大于复种方式、施肥制度等处理因素的影响。在四川丘陵寡照、阴湿的气候条件下，水稻的养分利用率降低，生产１００公斤稻谷吸收的氮、磷、钾量远较北方稻区和长江中下游稻区高。
A ten-year study was conducted to monitor uptake char.cteristies of N,P and K in rice, wheat and rapeseed under multiple-cropping system in Sichuan hilly area.The results indicated that content of N,P and K,conversion ratio of uptake N,availability of applied N,and growth rate responding to applied N for different varieties of rice varied with temperature and light conditions during the growing Period. For the same variety,uptake of N,P and K in rice grains and straw showed greater resmpse to yearly and sessonal climatic alterations than ways of fertilization and rotation,and other treatment effects. In Sichuan hilly ares,the weather conditions such as lack of sunshine and high humidity prevail. Rice thus has relatively lower availability of N,P and K,and usually uptakes higher amounts of these nutrients producing 100 kg rice than in Northern China and middle and lower reaches of Yangtze River rice-growing area.
出处
《西南农业学报》
CSCD
1995年第4期66-73,共8页
Southwest China Journal of Agricultural Sciences
关键词
水稻
小麦
油菜
养分含量变化
多熟制
rice wheat rapeseed change of nutrient content long-term monitoring
