Reducing Chemical Fertilizer Application in Greenhouse Vegetable Cultivation under Different Residual Levels of Nutrient

Author:

Zhou Nannan1,Chen Yujiao1,Wang Jiajia2,Yang Wenbin1,Wang Ying123

Affiliation:

1. Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China

2. Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, China

3. Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241002, China

Abstract

Excessive chemical fertilizer application in greenhouse vegetable cultivation results in environmental risks and residual nutrients in the soil. Conventional plot experiments conducted in one field cannot recommend fertilizer reduction to farmers when the residual nutrient levels were various among different fields. In this study, nine plot experiments were simultaneously conducted in nine greenhouse fields where the soils could reflect different residual levels of nutrient, with two application rates (100 and 0%) for each nitrogen, phosphorus, and potassium fertilizer. The results showed that fertilizer reduction did not decrease vegetable yield when soil nitrate, Olsen–phosphorus, and exchangeable potassium were ≥173.3, 45.8, and 93.1 mg kg−1, respectively. However, no N treatment decreased vegetable yields in fields 1–3 because the inadequately residual nitrate (≤103.9 mg kg−1) in these fields led to low nitrate absorbed from sources other than chemical fertilizer, high recovery efficiencies of N, and high productivity of N absorbed from chemical fertilizer. Residual nitrate that soil EC could reflect was the limiting factor of yield under fertilizer reduction. This study indicated that reducing fertilizer in greenhouse vegetable cultivation should be based on the residual level of nutrients in the soil, which is meaningful in agricultural sustainability and environmental safety.

Funder

the Natural Science Foundation of Anhui Province

the University Synergy Innovation Program of Anhui Province

the Foundation of Anhui Laboratory of Molecule-Based Materials

Anhui Provincial Key Laboratory of Nutrient Recycling

the Anhui Provincial Foundation for Overseas Students

Publisher

MDPI AG

Subject

Plant Science,Agronomy and Crop Science,Food Science

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