Effects of N,P and K Fertilizers on Growth of Clover Nitrogen-fixing Rhizobia and Soil Fertility after Plantation  

氮磷钾对红花草固氮根瘤菌生长及种植后土壤肥力的影响（英文）

作　　者：刘亚柏[1] 朱庆锋 毕道杰 王润芳 

机构地区：[1]江苏丘陵地区镇江农业科学研究所,江苏句容212400 [2]句容市农业委员会,江苏句容212400

出　　处：《Agricultural Science & Technology》2016年第4期906-911,915,共7页农业科学与技术（英文版）

基　　金：Science&Technology Specific Project for Enriching People and Strengthening County Economy(BN2015221)~~

摘　　要：In order to develop organic rice and increase paddy soil fertility by cloverorganic rice rotation, the effects of N, P and K fertilizers on growth of clover nitrogen-fixing rhizobia and soil fertility after plantation were investigated, thereby providing certain reference for reasonable cultivation of clover and improvement of soil fertility. A two-year experiment was conducted from 2012 to 2013. The clover was cultivated after rice every year, and different levels of N, P and K fertilizers were applied before winter. In the treatment group, no fertilizer was applied. The effects of different fertilizers and different application amounts on clover yield, nitrogen-fixing rhizobia quantity, nitrogen-fixing rhizobia weight and soil fertility after plantation were analyzed. The results showed that the application of N, P and K fertilizers in the early stage had significantly effect on the growth of clover. When the application amount of N fertilizer was 75 kg/hm^2（N 46%）, the clover yield, nitrogen-fixing rhizobia quantity and nitrogen-fixing rhizobia weight were highest. The soil nitrogen content after plantation increased with the increase of the application amount of N fertilizer, while the P and K content decreased and then increased with the increased application amounts. Soil available P content increased with the increased application amounts of N and P fertilizers, but it did not change significantly with the increased application amount of K fertilizer. Soil available K content increased first and then decreased with the increased application amounts of N and P fertilizers.When the application amounts of N and P fertilizers were 150（N 46%） and 300（P_2O_5 12%） kg/hm^2, soil available K content reached the maximum. Soil organic matter content increased with the increased application amounts of N, P and K fertilizers. Therefore, in the cultivation of clover, appropriate application of N, P and K fertilizers in the early stage can improve clover yield and soil fertility.为了发展有机水稻,以红花草-有机水稻轮作培肥水田土壤肥力,研究氮、磷、钾对红花草固氮根瘤菌生长及种植后土壤肥力的影响,为红花草的合理种植、培肥地力提供依据。2012~2013 2年稻后茬种植红花草,过冬前分别单独施用不同用量的氮肥、磷肥、钾肥,以不施肥为对照,探讨不同肥料不同用量对红花草产草量、固氮根瘤菌数量、固氮根瘤菌重量的影响及种植后的土壤肥力变化状况。研究结果表明:红花草前期补施氮、磷、钾,氮素对红花草的影响较大,在施氮75 kg/hm^2(N 46%)时,产草量最高,固氮根瘤菌数量最多,固氮根瘤菌重量大;种植后土壤全氮变化表现为不同施氮量增幅随肥料用量增加而增加,施磷、施钾各处理增幅随肥料用量增加而先降后升;土壤速效磷变化为施氮、施磷各处理增幅随肥料用量增加而增加,施钾各处理增幅趋势表现不明显;土壤速效钾变化表现为施氮、施磷各处理增幅变化趋势是随肥料用量增加先升后降,在施氮150 kg/hm^2(N 46%)、施磷300 kg/hm^2(P_2O_5 12%)时,土壤速效钾增幅达最大;土壤有机质变化表现为增幅随肥料用量增加而增加。所以,种植红花草,前期适当补施氮、磷、钾,可以提高红花草产草量,有效提高土壤肥力。

关 键 词：N fertilizer P fertilizer K fertilizer CLOVER Nitrogen-fixing rhizobia Soil fertility 

分 类 号：S511[农业科学—作物学] S551.9