Abstract
Based on the principle of soil water balance, the change of soil water content during the whole growth period of eggplant with the variety “Angela” as the material is simulated through the test of greenhouse environmental factors. The crop coefficient is determined by the optimization method. The evapotranspiration of eggplant is simulated under the condition of drip irrigation under mulch film. The results showed that the simulated values of soil water content in the growth period of eggplant are in good agreement with the measured values, and the relative error is less than 10%. The variation rule of the crop coefficient and eggplant leaf area index are consistent. The crop coefficient in the early increases gradually, in the vigorous growth period of crop coefficient reaches the maximum value of 0.518, then began to decreases from 0.518 reduced to 0.505 and then increased gradually. The fluctuation is mainly affected by pruning management. The change of water requirement of eggplant in greenhouse is smaller in the early stage of growth between 0.2–2.4 mm/d. And the change in the late of the growth period is larger between 0.1–3.1 mm/d. The accumulated value of evaporation and transpiration increases gradually, and the highest value is 290 mm/d.
Highlights
The soil water content of root layer has great influence on the growth, yield and quality of eggplant
Eggplant leaf area index from 0.63 initial increases gradually, after reaching the peak value appeared in the first increase and decrease, and increase the volatility process, the main reason is the eggplant pruning management measures
We get the maximum value of the leaf area index of eggplant in the whole growth period is 1.07, and the minimum is 0.53
Summary
The soil water content of root layer has great influence on the growth, yield and quality of eggplant. Evaporation and transpiration in vegetable research is generally under traditional irrigation condition, and mainly aims at different types of vegetables water requirement characteristic and different growth stages water requirement characteristic and different natural conditions of vegetables water requirement rules to conduct qualitative analysis. The research results obtained under the traditional production conditions are obviously not suitable for the crop water requirement under the condition of drip irrigation in greenhouse. Calculation model for the domestic fruit and vegetable crops evapotranspiration is mainly to establish water requirement regression empirical model using meteorological factors and yield. The empirical model can be used for the calculation of crop water requirement in a certain period of time, but for different regions, it is necessary to accurately estimate crop water requirement in combination with local climatic conditions, and to correct the parameters of the formula [5-9]
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