黑麦草—水稻种植模式生态经济评价

Ecological and Economic Evaluation of Ryegrass-rice Cropping System

通过田间试验研究了不同氮肥水平黑麦草—水稻和小麦—水稻两种种植模式的水稻产量、经济效益和对土壤肥力的影响。结果表明,两种种植模式中水稻的产量差异不明显;在施氮0、75kgh/m2情况下,黑麦草—水稻的经济效益分别比小麦—水稻低23.91%、10.12%,而在施氮150、225kgh/m2情况下,黑麦草—水稻经济效益分别比小麦—水稻高2.54%、15.28%;黑麦草—水稻种植模式土壤的有机质、全氮和碱解氮比小麦—水稻模式高,速效磷、速效钾则相反。

The field experiments were carried out to evaluate the rice yields, economic benefits and soil fertility of ryegrass-rice and wheat-rice cropping systems under different nitrogen fertilizer rates. The results showed that the rice yields had no obvious differences between ryegrass-rice and wheat-rice cropping systems. The benefits of ryegrass-rice cropping system were decreased by 23.91% and 10.12% respectively at 0 and 75kg/hm^2 nitrogen levels, but increased by 2.54% and 15.28% respectively at 150 and 225kg/hm^2 nitrogen levels, compared with that of wheat-rice cropping system. The ryegrass- rice cropping system can enhanced organic matter, total nitrogen and alkalized nitrogen of soil, but decreased available P and available K.