Dynamics of Potassium Concentrations in Soil Solution and Characteristics of Potassium Leaching from Soil in Greenhouses with Cucumber

doi:10.7668/hbnxb.2016.03.034

Abstract

Abstract: In order to probe into variation characteristics of leaching of potassium from soil,a study was conducted in cucumber greenhouse in Yongqing of Hebei Province to investigate dynamics of potassium concentrations in soil solution and leaching of potassium from soils during the whole cucumber growth period by the different fertilizer application.The results showed that dynamics of potassium concentrations in soil solution collected in the depths at 35-40 cm and 95-100 cm soil layers.Potassium concentration (47.7-114.0 mg/L) for all the treatments increased at first,decreased subsequently and then increased again in soil solution at 35-40 cm for greenhouse.Meanwhile potassium concentrations in soil solution at 95-100 cm (40.3-105.0 mg/L) kept the similar dynamic trend to that at 95-100 cm for conventional potassium rate treatment.However,potassium concentrations in soil solution of CK (49.6-66.5 mg/L) and the treatment of recommended potassium rate (30.6-42.8 mg/L) kept stable during different periods at 95-100 cm.Potassium levels of leaching solution increased with increase of potassium application rate and ranged at 27.9-65.1 mg/L for the cucumber greenhouse.Total amounts of potassium leaching from soil layer (0-100 cm) of the greenhouse was 154 kg/ha.Therefore,the application rates at 600 kg/ha could not only keep the high yields of cucumber and reduce soil potassium leaching loss,but also increase the economic benefit and environment benefit effectively.

Key words: Greenhouse soil, Potassium leaching, Potassium fertilizer agronomic efficiency, Soil solution, Soil texture

CLC Number:

S151.9+3

LIU Jianxia, ZHAO Yingnan, LI Bowen, LIU Wenju, MA Li. Dynamics of Potassium Concentrations in Soil Solution and Characteristics of Potassium Leaching from Soil in Greenhouses with Cucumber[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(3): 233-238. doi: 10.7668/hbnxb.2016.03.034.

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