Effects of Different Nitrogen Application Levels on Phosphatase Activity in Farmland Black Soil under Condition of Deep Burial of Straw

doi:10.11924/j.issn.1000-6850.casb2022-0919

Abstract

Abstract:

Straw return is an important agricultural measure to regulate soil fertility, which can affect soil enzyme activity. To investigate the effect of straw deep burial on soil phosphatase activity and soil phosphorus under different nitrogen fertilizer levels, this study used a split-zone experimental design with agricultural black soil as the research object. No straw and straw deep burial were set as the main factors, and four nitrogen fertilizer levels (pure N, 0, 135, 180, 225 kg/hm²) were used as secondary factors to determine phosphatase activity and soil total phosphorus and effective phosphorus contents. The results showed that (1) soil phosphatase activity increased and then decreased with the extension of maize growth period, reaching the highest level at the elongation stage and decreasing to the lowest level at the harvesting stage. Compared with the straw-free treatment, the straw deep burial treatment significantly increased the activity of soil phosphatase (P<0.05), and the phosphatase activity showed a trend of increasing and then decreasing with the increase of nitrogen application, and the highest phosphatase activity was 344.66 mg/(g·24 h) at 180 kg/hm² of nitrogen application; (2) compared with the straw-free treatment, the straw deep burial treatment increased the content of total phosphorus and effective phosphorus, but the difference was not significant (P>0.05). The trend of effective phosphorus content in all treatments was the same, increasing first and then decreasing with the increase of N application. The highest content of effective phosphorus reached at 102.17 mg/kg under the straw deep burial treatment at 180 kg/hm² of N application; (3) correlation analysis showed that soil phosphatase activity had a highly significant positive correlation with soil effective phosphorus content (P<0.01), and did not reach a significant level of difference with soil total phosphorus content (P>0.05). In conclusion, the phosphatase activity and effective phosphorus content of soil were highest when straw was buried deeply in N180 treatment.

Key words: deep burial of straw, nitrogen fertilizer level, black soil, soil phosphatase activity, correlation

LV Xuemei, XU Sisi, WANG Yao, CHEN Yimin, SUI Yueyu, JIAO Xiaoguang. Effects of Different Nitrogen Application Levels on Phosphatase Activity in Farmland Black Soil under Condition of Deep Burial of Straw[J]. Chinese Agricultural Science Bulletin, 2023, 39(32): 84-90.

Figures/Tables 5

References 32

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处理		土壤磷酸酶	全磷	有效磷
无秸秆	土壤磷酸酶	1
	全磷	-0.208	1
	有效磷	0.638^**	-0.062	1
秸秆深埋	土壤磷酸酶	1
	全磷	-0.232	1
	有效磷	0.729^**	-0.210	1
双因素分析（P值）
秸秆深埋		0.135	0.079	0.000^**
氮肥水平		0.000^**	0.196	0.129
秸秆深埋×氮肥水平		0.972	0.990	0.953

处理		土壤磷酸酶	全磷	有效磷
无秸秆	土壤磷酸酶	1
	全磷	-0.208	1
	有效磷	0.638^**	-0.062	1
秸秆深埋	土壤磷酸酶	1
	全磷	-0.232	1
	有效磷	0.729^**	-0.210	1
双因素分析（P值）
秸秆深埋		0.135	0.079	0.000^**
氮肥水平		0.000^**	0.196	0.129
秸秆深埋×氮肥水平		0.972	0.990	0.953