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Predicting Pepper Fruit Yield Based on Temperature and Solar Radiation

Journal of Agricultural Science and Technology(B) 2014年第5期4卷 360-367页

作者： eviatar ityel Lior Avraham Hana Alon Rivka Offenbach Extension Service Ministry of Agriculture Bet Dagan 50250 lsrael R&D Darom Besor Eshko195465 Israel R&D Arava Central and Northern Arava 86825 Israel

Two separate experiments were conducted in bell pepper （Capsicum annum L.） in order to evaluate the effects of temperature and radiation on fruit yield. The results of the temperature experiment were integrated into the radiation experiment to give an overall empirical model for potential pepper fruit yield grown in greenhouse. In the temperature experiment, pepper plants were planted during the summer time of Israel in the Arava region in a commercial, one hectare greenhouse, equipped with a cooling wet-mat system. Eleven plots were assigned along the 80 m down the row from the wet mat. Air seasonal temperatures were affected by the distance from the wet-mat and linearly increased at the rate of 0.036 ℃/m, while relative humidity was not affected. Fruit yield dropped from 19.4 kg/m at a distance of 20 m, to 13.1 kg/m2 at 80 m away from the wet-mat, respectively. Yield regression decreased linearly with increased temperature at -11%/℃. In the radiation experiment, during the summer time of Israel in the Western Negev region, three sweet pepper varieties were grown under six radiation treatments, which accumulated to the following relative global radiation fractions （lint/lout）： 0.72, 0.61, 0.46, 0.38, 0.32 and 0.21 from outside radiation. The three varieties did not differ in their response to radiation. The seasonal temperature normalized yield response to radiation quantity at 21 ℃ （Y21） yielded a linear regression formula with a slope of 7.6 × 10^-3 kg/m^2/MJ. The multiplicative model of temperature and radiation on fruit yield was found to predict well the potential fruit yield for various locations and seasons in Israel.

关键词： Sweet pepper greenhouse radiation temperature model fruit yield.

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