A field trial was conducted to study the effects of biochar application rates and the straw-return on
soil water content,soil nutrient,crop yield,and water use efficiency. There were five treatments:no biochar(CK),
15 t·hm
-2
biochar(BC1),30 t·hm
-2
biochar(BC2),45 t·hm
-2
biochar(BC3),and straw-return. Results
showed that the soil NO -
3 -N,NH
+
4 -N,available K,and organic matter content increased with increasing applica-
tion rates of biochar in all growth stages of wheat.Soil water storage,available P,and crop yield,water-use effi-
ciency increased initially but decreased subsequently with increasing application rates of biochar. Compared to the
control and other biochar rates,the 30 t·hm
-2
of biochar significantly achieved peak yield (a 17.2% increase over
CK to 6 640 kg·hm
-2
) and water-use efficiency (an increase of 17.8% to 18.1 kg·hm
-2
·mm). The straw-
return increased yield by 10.5% but no effect on the water-use efficiency. Therefore,applying the appropriate rate
of biochar can significantly improve soil fertility,crop yield,and water-use efficiency.
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