Effects of Optimized Fertilization on Plant Growth and Soil Nutrients Supply in Saline Fields

doi:10.7668/hbnxb.2017.01.033

Abstract

Abstract: Effects of optimized fertilization on plant growth and soil nutrients supply in saline fields of Dongying City were studied under filed condition for two years.Four treatments consisting of no fertilization, farmers traditional fertilization,optimized fertilization,optimized fertilization+organic fertilizer.The results showed that cotton seed yield,fertilizer agronomic efficiency and partial factor productivity was effectively enhanced by optimized fertilization and optimized fertilization+organic fertilizer,compared to farmers traditional fertilization.Composition of saline ions was changed by fertilizer application which was remarkably higher than no fertilization in various degree in the contents of K⁺,Ca²⁺,Mg²⁺and SO₄^2-,meanwhile the percentage of Na⁺and Cl^- was reduced 2.29%,3.45%and 6.15% by farmers traditional fertilization,optimized fertilization and optimized fertilization+organic fertilizer. Microorganism and enzyme activity of soil was increased by optimized fertilization+organic fertilizer significantly, that the activity of urase and alkaline phosphatase was enhanced 7.8%-17.0% and 5.0%-13.3% respectively, compared to farmers traditional fertilization and optimized fertilization. The available nutrients of soil were increased by fertilizer application, which showed that the available P and K contents of optimized fertilization+organic fertilizer treatment were in higher levels. Meanwhile, the NO₃^--N and NH₄⁺-N contents were farmers traditional fertilization > optimized fertilization+organic fertilizer > optimized fertilization > no fertilization, that it indicated that the contents of NO₃^-N and NH₄⁺-N were reduced by optimized fertilization,then the risk of running off would be re duced.In the condition of reducing chemical fertilizer, useing the optimized treatment of nitrogen and potassium basal application and dressing at bud and flowering stage could not only ensure the purpose of cotton yield, but also reduce the dosage of fertilizer, meanwhile the effect of cotton yield while cooperating with organic fertilizer was better.

Key words: Optimized fertilization, Saline soil, Cotton growth, Soil nutrients supply

CLC Number:

S562

DU Haiyan, SUN Xiaoli, LIU Xinwei, XU Shuang, CUI Dejie. Effects of Optimized Fertilization on Plant Growth and Soil Nutrients Supply in Saline Fields[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2017, 32(1): 220-225. doi: 10.7668/hbnxb.2017.01.033.

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