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irrigation for crops in a sub-humid environment - vii evaluation of irrigation strategies for cotton

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 218
empirical functions to predict the nitrogen uptake, increase in lai and minimum leaf water potential (lwp) of cotton were incorporated into a water balance model for the namoi valley, n. s w. a function was then developed to describe the lint yield of irrigated cotton as a function of water stress days at 4 stages of development, total nitrogen uptake and days of waterlogging. a water stress day was defined as predicted minimum leaf water potential less than $minus$ 1. 8 mpa up to 90 days after sowing and $minus$ 2. 4 mpa thereafter; stress reduced yield by up to 40 kg lint ha** $minus$ **1 d** $minus$ **1 with greatest sensitivity at 81-140 days after sowing and when n uptake was highest. nitrogen uptake was reduced by 0. 98 kg per ha and yield reduced by 33. 2 kg lint ha** $minus$ **1 for each day of waterlogging. the model was used to evaluate various irrigation strategies by simulating production of cotton from historical rainfall data. refs
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