Effect of Straw Returning on Yield and Soil Potassium Balance of Double Cropping Rice

doi:10.11924/j.issn.1000-6850.casb18110052

Abstract

Abstract:

Field experiments were carried out to explore the effects of straw returning on rice yield and soil potassium balance, to provide a basis for straw returning and potassium use in double cropping rice area. The experiments were set in Tongcheng, Anhui in 2013 to 2015 with five treatments, including no fertilization (CK), no fertilization + straw returning (CK+S), fertilization (NPK), fertilization + straw returning (NPK+S) and nitrogen and phosphorus + 80% potassium + straw returning (NP+80%K+S). The results showed that there was no significant negative effect on rice yield among these treatments, and the rice yield under NP+80%K+S was not reduced. The apparent balance coefficient of potassium of CK+S, NPK and NPK+S was 0.90, 0.48 and 1.40, respectively. These results indicate that the application of chemical fertilizer can not inhibit the consumption of potassium by crops. The straw returning can increase the content of soil available potassium significantly, and improve the balance of soil potassium, which is important to maintain the local soil potassium level.

Key words: straw returning, double cropping rice, yield, potassium balance

CLC Number:

S147.5

Zhixiang Sun, Shang Han, Ji Wu, Min Li, Hui Wang, Wenlong Cheng, Shan Tang, Lin Zhu. Effect of Straw Returning on Yield and Soil Potassium Balance of Double Cropping Rice[J]. Chinese Agricultural Science Bulletin, 2020, 36(9): 9-13.

Figures/Tables 3

References 20

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处理	早稻		晚稻		周年产量
处理	2014	2015	2014	2015	2014	2015
CK	3094b	3132b	3534b	3750b	6628b	6882b
CK+S	3096b	3168b	3494b	3843b	6590b	7011b
NPK	5774a	5272a	5161a	6853a	10935a	12125a
NPK+S	5714a	5350a	5360a	7130a	11074a	12480a
NP+80%K+S	5953a	5407a	5280a	7315a	11233a	12785a

处理	早稻		晚稻		周年产量
处理	2014	2015	2014	2015	2014	2015
CK	3094b	3132b	3534b	3750b	6628b	6882b
CK+S	3096b	3168b	3494b	3843b	6590b	7011b
NPK	5774a	5272a	5161a	6853a	10935a	12125a
NPK+S	5714a	5350a	5360a	7130a	11074a	12480a
NP+80%K+S	5953a	5407a	5280a	7315a	11233a	12785a

轮作<break/>周期	处理	钾肥用量/(kg/hm²)		作物钾移走量/<break/>(kg/hm²)	钾素表观盈量/<break/>(kg/hm²)	钾平衡<break/>系数	钾实际<break/>平衡率
轮作<break/>周期	处理	化学钾	秸秆钾	作物钾移走量/<break/>(kg/hm²)	钾素表观盈量/<break/>(kg/hm²)	钾平衡<break/>系数	钾实际<break/>平衡率
2014	CK	0	0	177.0	-177.0	0.00	-100.0
	CK+S	0	175	180.0	-5.5	0.97	-3.1
	NPK	180	0	374.7	-194.7	0.48	-46.6
	NPK+S	180	311	354.1	137.0	1.39	38.7
	NP+80%+S	144	334	362.6	98.4	1.32	27.2
2015	CK	0	0	183.1	-183.1	0.00	-100.0
	CK+S	0	158	193.3	-35.1	0.82	-18.2
	NPK	180	0	378.1	-198.1	0.48	-52.4
	NPK+S	180	323	358.7	144.3	1.40	42.2
	NP+80%+S	144	328	386.0	85.84	1.22	22.2
总计	CK	0	0	360.1	-360.1	0.00	-100.0
	CK+S	0	333	373.3	-40.3	0.90	-10.8
	NPK	360	0	752.8	-392.8	0.48	-52.2
	NPK+S	360	634	712.8	281.2	1.40	39.5
	NP+80%+S	288	662	748.6	201.4	1.27	27.0

轮作<break/>周期	处理	钾肥用量/(kg/hm²)		作物钾移走量/<break/>(kg/hm²)	钾素表观盈量/<break/>(kg/hm²)	钾平衡<break/>系数	钾实际<break/>平衡率
轮作<break/>周期	处理	化学钾	秸秆钾	作物钾移走量/<break/>(kg/hm²)	钾素表观盈量/<break/>(kg/hm²)	钾平衡<break/>系数	钾实际<break/>平衡率
2014	CK	0	0	177.0	-177.0	0.00	-100.0
	CK+S	0	175	180.0	-5.5	0.97	-3.1
	NPK	180	0	374.7	-194.7	0.48	-46.6
	NPK+S	180	311	354.1	137.0	1.39	38.7
	NP+80%+S	144	334	362.6	98.4	1.32	27.2
2015	CK	0	0	183.1	-183.1	0.00	-100.0
	CK+S	0	158	193.3	-35.1	0.82	-18.2
	NPK	180	0	378.1	-198.1	0.48	-52.4
	NPK+S	180	323	358.7	144.3	1.40	42.2
	NP+80%+S	144	328	386.0	85.84	1.22	22.2
总计	CK	0	0	360.1	-360.1	0.00	-100.0
	CK+S	0	333	373.3	-40.3	0.90	-10.8
	NPK	360	0	752.8	-392.8	0.48	-52.2
	NPK+S	360	634	712.8	281.2	1.40	39.5
	NP+80%+S	288	662	748.6	201.4	1.27	27.0

处理	有机质/(g/kg)	全氮/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
CK	26.48a	1.65a	6.67b	69.91c
CK+S	26.91a	1.70a	7.08b	76.17b
NPK	27.03a	1.70a	13.75a	79.82b
NPK+S	27.04a	1.72a	14.50a	87.28a
NP+80%K+S	26.94a	1.73a	14.58a	90.29a