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Effects of Water and Nitrogen Supplyon Spinach(Spinacia oleracea L.)Growth and SoilMineral ResiduesEnglish Full Text

CHEN QING1, ZHANG HONGYAN1, TANG LILING1, LI XIAOLIN1 and H. P. LIEBIG21Department of Plant Nutrition, China Agricultural University, Beijing 100094 (China)2Institute for Fruit Science, Vegetable Science and Viticulture, Hohenheim University, D-70593 Stut

Abstract: Effects of conventional and optimized water and nitrogen managements on spinach (Spinacia olerocea L.)growth and soil mineral N (Nmi.) residues were compared in an open field experiment in which water balancemethod and N recommendation with the KNS-system were included. It was shown that the conventionalwater treatment (seasonal irrigated amount: 175 mm) reduced spinach growth compared to the water balancetreatments (seasonal irrigated amount: 80 and 85 mm) at the same N supply level due to N loss throughleaching caused by excessive water supply. Although 309 kg N ha-1 was applied in the conventional Ntreatment, compared to 82 and 66 kg N ha-l in the optimum N treatments, no significant difference in cropyield was investigated between the N treatments with the same irrigation practice. N uptake in spinach andsoil residual Nmin contents were also significantly affected by the irrigation practices. The conventional watersupply not only decreased water use efficiency, but also resulted in excessive NO3-N being leached below theroot zone. In order to meet the same target value of N requirement for the next crop, cauliflower, based onthe KNS-system, at least extra 50 kg N ha-1 was needed in the conventional water treatments in comparisonto the water balance treatment.
  • Series:

    (D) Agriculture

  • Subject:

    Horticulture

  • Classification Code:

    S636.107

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