Conclusion
In the dryland farming area of northwest China, we found that the effects of straw mulching differed
with the variation in precipitation among the three experimental seasons. In a rainy year, there were no
significant (P>0.05) effects of straw mulch on the soil water storage, wheat yield, and WUE. However,
in a normal year, straw mulching significantly (P< 0.05) improved the soil water conditions, increased
the wheat yield, and increased the WUE. In addition, compared with the growth-period mulch treatments,
the whole-period mulch treatments obtained greater improvements, particularly the SM1 and
SM2 treatments. Because of constraints on the amount of wheat straw available, we conclude that SM2
(6000 kg ha−1
straw mulching during the whole period) is the most effective treatment for improving
wheat production in the dryland farming area of northwest China.
ConclusionIn the dryland farming area of northwest China, we found that the effects of straw mulching differedwith the variation in precipitation among the three experimental seasons. In a rainy year, there were nosignificant (P>0.05) effects of straw mulch on the soil water storage, wheat yield, and WUE. However,in a normal year, straw mulching significantly (P< 0.05) improved the soil water conditions, increasedthe wheat yield, and increased the WUE. In addition, compared with the growth-period mulch treatments,the whole-period mulch treatments obtained greater improvements, particularly the SM1 andSM2 treatments. Because of constraints on the amount of wheat straw available, we conclude that SM2(6000 kg ha−1 straw mulching during the whole period) is the most effective treatment for improvingwheat production in the dryland farming area of northwest China.
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