沿江江南地区水稻钾、氮吸收特性与施钾效应研究

Study on K,N Absorption Characteristics of Rice and Potassium Application Effects in Jiangnan Region along River

[目的]探索沿江江南地区水稻适宜钾肥用量。[方法]采用田间试验方法,研究水稻钾、氮吸收特性与施钾效应。[结果]在适量氮肥条件下,随着施钾量的增加,水稻产量提高,但当氮肥高到一定极限后,水稻产量不再增加,反而会下降;在氮肥用量相同的条件下,随着钾肥施用量的增加,水稻吸钾量也相应提高,水稻氮吸收量和氮肥利用率也提高;在施钾量相同条件下,高氮处理吸氮量反而减少。[结论]在该试验土壤肥力条件下,水稻钾肥(K2O)推荐用量为130 kg/hm2。

[Objective] The research aimed to explore the optimum amount of potassium fertilizer of rice in Jiangnan region along river.[Method] The field experiment was conducted to study the rice absorption characteristics of K,N and the effects of potassium application.[Result]Under the condition of optimum amount of nitrogen fertilizer,rice yield was increased with the increase of K fertilizer.But rice yield wasn＇t increased when the nitrogen amount reached the certain limits.When the nitrogen amount was the same,rice potassium uptake,nitrogen uptake and rice nitrogen use efficiency were increased with the increase of the application of potassium.When the potassium amount was the same,nitrogen uptake of high nitrogen treatment reduced.[conclusion] Under the condition of soil fertility,recommended dosage of potassium fertilizer was 130 kg/hm2.