Effects of Combined Applications of Nitrogen and Phosphorus on Soil Enzyme Activities and Soil Available Nutrition in Maize-soybean Relay Intercropping System

doi:10.7668/hbnxb.20190452

Abstract

Abstract: To exploring the effects of fertilization treatment on corn nutrient accumulation, soil enzyme activity and soil available nutrient in maize-soybean intercropping system. Four nitrogen levels (N0 (0), N1 (120 kg/ha), N2 (180 kg/ha), N3 (240 kg/ha)) and four levels of phosphorus(P0 (0), P1 (35 kg/ha), P2 (70 kg/ha), P3 (105 kg/ha))were used in this study. The result showed that compared with maize monoculture, maize-soybean intercropping system had more obvious synergistic effect, which was 20.16% and 20.60%, respectively.In intercropping maize, nitrogen and phosphorus treatments had effection soil enzyme activity and soil available nutrient. At the same level of phosphorus, soil urease activity and soil available nitrogen content first increased and then decreased with the increase of nitrogen application amount, and the highest value was reached when nitrogen application was 180 kg/ha, soil phosphatase activity was inhibited and the content of available phosphorus was lower than that without nitrogen application. Under the same nitrogen level, soil urease, soil acid phosphatase activity and soil available phosphorus content increased with the increase of phosphorus application amount, and the content of available nitrogen increased first and then decreased.Correlation analysis showed that soil urease activity was positively correlated with soil available nitrogen content (r=0.636-0.812), and positively correlated with nitrogen and phosphorus accumulation in maize.Soil acid phosphatase activity was positively correlated with soil available phosphorus and plant phosphorus uptake, especially with the content of available phosphorus (r=0.634-0.851).In conclusion, under the maize-soybean intercropping system, due to the interspecific effect and the interaction of nitrogen and phosphorus,the activities of urease and acid phosphatase in rhizosphere soil were increased, the contents of basic nitrogen and available phosphorus in soil were increased, and the accumulation of nitrogen and phosphorus in maize was improved. Within the range of this experiment, the effect of nitrogen and phosphorus with nitrogen reduced to 180 kg/ha and phosphorus to 70 kg/ha in the intercropping system was the best.

Key words: Maize-soybean relay intercropping system, Nitrogen and phosphorus application, Maize nutrients uptake, Soil enzyme activities, Soil available nutrient

CLC Number:

CHEN Hong, WEN Xichen, ZENG Jinxi, PU Tian, YANG Wenyu, WANG Xiaochun. Effects of Combined Applications of Nitrogen and Phosphorus on Soil Enzyme Activities and Soil Available Nutrition in Maize-soybean Relay Intercropping System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(2): 133-143. doi: 10.7668/hbnxb.20190452.

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