Effect of straw returning and nitrogen reduction on soil nutrition, carbon pool and rice yield in rice field

doi:10.3969/j.issn.1004-1524.2019.04.15

›› 2019, Vol. 31 ›› Issue (4): 624-630.DOI: 10.3969/j.issn.1004-1524.2019.04.15

• Environmental Science • Previous Articles Next Articles

Effect of straw returning and nitrogen reduction on soil nutrition, carbon pool and rice yield in rice field

WANG Baojun, CHENG Wangda, CHEN Gui, SHEN Yaqiang, ZHANG Hongmei^*

Jiaxing Academy of Agricultural Sciences, Zhejiang Province, Jiaxing 314016, China

Received:2018-10-16 Online:2019-04-25 Published:2019-04-19

Abstract

Abstract: In order to determine the effects of straw returning and nitrogen reduction on soil nutrition, carbon pool and rice yield, a field experiment was conducted. It was shown that the proper treatment of straw returning and nitrogen reduction could improve soil quality and increase rice yield. Compared with application of 270 kg·hm^-2 N, straw returning with 240 kg·hm^-2 N significantly (P<0.05) increased the contents of soil organic matter, total nitrogen, available phosphorus, available potassium, total organic carbon by 33.86%, 13.83%, 54.64%, 21.60%, 33.81%, respectively, yet the contents of ammonium nitrogen, dissolved organic carbon and microbial biomass carbon were significantly (P<0.05) decreased by 13.69%, 49.22% and 32.36%, respectively. As for yield, straw returning with 240 kg·hm^-2 N was the highest. Compared with the treatments without N application (both without and with straw returning), rice yield of the treatment of straw returning with 240 kg·hm^-2 N was significantly (P<0.05) increased by 57.90% and 62.22%, respectively. Under the experimental conditions, the optimal straw returning and nitrogen fertilizer reduction model was the treatment of straw returning with 240 kg·hm^-2 N, which could improve soil nutrient, enhance soil carbon content, and increase rice yield.

Key words: straw returning, nitrogen fertilizer, soil nutrition, soil carbon pool, rice yield

CLC Number:

S147.2

WANG Baojun, CHENG Wangda, CHEN Gui, SHEN Yaqiang, ZHANG Hongmei. Effect of straw returning and nitrogen reduction on soil nutrition, carbon pool and rice yield in rice field[J]. , 2019, 31(4): 624-630.

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Effect of straw returning and nitrogen reduction on soil nutrition, carbon pool and rice yield in rice field

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