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Grain yields were improved by conservation tillage with straw cover or straw standing,and that of NPS20,NPS40,NS40,NS20,NSB40 and NSB20 were increased by 53.08%,46.59%,40.81%,19.93%,17.33% and 4.34% respectively compared with the CT.
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结果表明;留茬覆盖免耕保护性耕作提高了春小麦的产量;NPS20;NPS40;NS40;NS20;NSB40和NSB20较CT分别增产53.;08%25;46
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