ACTA AGRICULTURAE BOREALI-SINICA ›› 2020, Vol. 35 ›› Issue (2): 126-132. doi: 10.7668/hbnxb.20190616

Special Issue: Soil fertilizer

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Effects of Summer Catch Crops with Different Planting Densities on Greenhouse Soil Phosphorus Forms and Mobility

PEI Zhiqiang, LU Shuchang, WANG Xi, WANG Dafeng   

  1. College of Agronomy and Resources Environment, Tianjin Agricultural University, Tianjin 300384, China
  • Received:2019-12-11 Published:2020-04-28

Abstract: Soil phosphorus accumulation in intensive greenhouse is becoming more and more serious, leading to an increase in soil phosphorus environmental risks. In order to reduce the accumulation of phosphorus in the soil of the greenhouse, this study designed three different planting densities for the short-term high biomass, deep roots of fresh waxy corn and feeding sweet sorghum in the greenhouse vegetable field leisure period. That was, waxy corn 67 500 (NY1), 105 000 (NY2), 135 000 (NY3) plants/ha, feed sweet sorghum 105 000 (TG1), 150 000 (TG2), 210 000 (TG3) plants/ha.The effects of catch crops on their phosphorus absorption, phosphorus content in greenhouse soil, and phosphatase activity were studied.The results showed that the total biomass and total phosphorus uptake of the two kinds of catch crops increased first and then decreased with the increase of planting density.In feeding sweet sorghum treatments,TG2 treatment had the highest phosphorus absorption, which was 150.03 kg/ha, and in waxy corn treatments, NY2 treatment had the highest phosphorus absorption, which was 128.80 kg/ha. Each treatment of waxy corn and TG1,TG2 treatments significantly reduced the total phosphorus content in the soil surface, which decreased by 15.2%-19.7% and 10.7%-10.9%. The treatment of different catch crops significantly reduced the water-soluble phosphorus content in the soil surface by 28.4%-41.0% and 16.2%-26.1%. NY2, NY3, TG1 and TG2 treatments had a better effect on the control of water-soluble phosphorus in the lower layer soil. In addition, the alkaline phosphatase of the treatment of waxy corn did not increase significantly at the early stage of planting broccoli, which could control the organic phosphate mineralization in the soil. TG2 treatment could reduce the water-soluble phosphorus content in the early post-stubble soil.Therefore, under the conditions of this experiment, the suitable density of waxy corn and feeding sweet sorghum in the greenhouse vegetable field were 105 000,150 000 plants/ha, NY2 treatment had a significant effect on reducing the accumulation of phosphorus in the soil and controlling the downward movement of phosphorus,TG2 was more obvious for absorbing soil phosphorus in the greenhouse.

Key words: Catch crops, Greenhouse soil, Phosphorus forms, Planting density, Soil layer migrate

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Cite this article

PEI Zhiqiang, LU Shuchang, WANG Xi, WANG Dafeng. Effects of Summer Catch Crops with Different Planting Densities on Greenhouse Soil Phosphorus Forms and Mobility[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(2): 126-132. doi: 10.7668/hbnxb.20190616.

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