Study on Reducing for Planting Summer Catchcrop-Waxy Corn Soil Residual Nitrogen Risk under Different Rainfall in the Northern Greenhouse

doi:10.3969/j.issn.1000-7091.2012.02.036

Abstract

Abstract: Excessive fertilizer and irrigation input was common in greenhouse vegetable cropping system in?North China，which seriously affected the sustainable development of protected vegetable production． In fallow season，there were two treatments in the experiment:control (with no crop) and planting catch crop． Bromine-marked?tracing was used to the waxy corn roots sampling，to further verify the role of cultivating the catch crop in reducing?nitrogen loss． The main results showed that under the experimental conditions，the cultivation of catch crops could?significantly reduce the soil Nmincontent，especially in the surface soil Nmincontent． Under simulated drought conditions treatment，with catch crops planted at the harvest ending，a decrease of Nmincontent could be found in 0 －120?cm soil layers． In the follow treatment with all layers from 0 to 180cm，soil Nmincontent all increased，this meaned?that in the period of trail soil nitrogen had mineralization in different degree． Through different rainfall simulations, showed that a large amount of rainfall in summer was a key factor of soil nitrogen leaching，and soil Nmincontent of?the higher volume of higher nitrogen leaching． Catch crops could effectively absorb the nutrients in the soil，to simulate rainfall of drought year treatment nitrogen removed by waxy corn was 172． 6 kg/hm2，and then the rainfall of the?year treatment waxy corn could taken away nitrogen reached 146． 6 kg/hm2． Bromine-marked trail had turnout the?capacity of catch crops for nitrogen，in this trail the bromide in lower soil layer all have upward migration． This research confirmed that planting catchcrop-waxy corn was advantageous to use soil residual nitrogen and reduce nitrogen leaching risk，which provided scientific references for optimizing nitrogen management in typical planting model?of northern greenhouse．

Key words: Catch, Waxy corn, Nitrogen leaching, Greenhouse

CLC Number:

S625.5+4

LU Shu-chang, JIANG Chun-guang. Study on Reducing for Planting Summer Catchcrop-Waxy Corn Soil Residual Nitrogen Risk under Different Rainfall in the Northern Greenhouse[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(2): 189-195. doi: 10.3969/j.issn.1000-7091.2012.02.036.

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