Effect of different irrigating quotas on growth of maize:A perspective of effective accumulative temperature
The effects of different irrigating quotas on the growth of spring maize were explored to provide a theoretical basis for optimizing the irrigation system of spring maize in Karamay.From May to September 2021,a field experiment on spring maize was carried out in the Karamay Agricultural Comprehensive Development Zone to study the effects of different irrigation amounts on plant height,chlorophyll,leaf area index and aboveground biomass during the growth period of maize.The normalized Logistic model was established to explore the correlation between effective accumulated temperature and maize growth and biomass.When the irrigation quota was increased from 225m3/hm2 to 525m3/hm2,it was more conducive to promoting the growth of maize.With the increase of effective accumulated temperature,plant height showed a growing trend,chlorophyll showed a trend of increasing firstly and then decreasing,and leaf area index and aboveground dry matter accumulation showed a slow-fast-slow dynamic change.The fitting index(R2)of fitting value of leaf area index to the actual value was bigger than 0.9,and the standard deviation of the dry matter accumulation fitting equation is less than 0.06,indicating that the fitting equation established by the Logistic model can better simulate the change and accumulation of leaf area index and dry matter of spring maize.Under the treatment of the maximum value of 525m3/hm2,the relative leaf area index under ideal conditions was higher than that of other treatments,the time for dry matter accumulation of aboveground was longer,and the growth rate was the largest during the rapid increase period.Too much or too little irrigation water had negative effects on leaf area index and above-ground dry matter accumulation of maize.Therefore,an irrigation water quota of 525m3/hm2 is more suitable for planting spring maize by drip irrigation in Karamay.
irrigating water quotaspring maizeleaf area indexeffective accumulative temperaturedry matter
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