Abstract
Three years (2014-15 to 2016-17) experimental data collected at Main Vegetable Research Station, Anand was used to calibrate and validate the SUBSTOR- potato model for three cultivars of potato (K. Badshah, K. Lokhar and K. Pokhraj). The validated model was used to simulate the tuber yield by changing the maximum and minimum temperature (+30 to -30C)in different months (November, December, January and February). Results revealed that the elevated temperature had negative effect on tuber yield and reduced temperature had positive effect on tuber yield. Among the varieties, K. Lokhar was least affected by the temperature variation. K. Pokhraj was found to be most sensitive to elevated temperature, while K. Badshah was most beneficial in reduced temperature. Temperature variation during December and January was found to have maximum effect on normal sown potato crop. The effect of minimum temperature on tuber yield was more than that observed with maximum temperature.
Highlights
Potato (Solanum tuberosum L.) is a major world food crop and by far the most important vegetable crop in terms of quantities produced and consumed worldwide (FAO, 2005).In India, potato is grown in all parts of the country (Annon, 2016).Gujarat is the fourth largest potato producing states in the country after Uttar Pradesh, Bihar and West Bengal with average yield of 26.30 t ha-1 (Annon, 2015)
In this paper an attempt has been made to assess the effect of intra-seasonal variation in temperatures on tuber yield of potato in middle Gujarat using SUBSTOR potato model
Among different dates of sowing, the maximum tuber yield (30.21 t ha-1) was observed in third date i.e. November 10 sown potato followed by November 25 sown crop (29.67 t ha-1) and the lowest (14.78 t ha-1) in early sown (October 10) potato.Among the varieties, the highest tuber yield (28.27 t ha-1) was observed in cultivar K
Summary
Potato (Solanum tuberosum L.) is a major world food crop and by far the most important vegetable crop in terms of quantities produced and consumed worldwide (FAO, 2005).In India, potato is grown in all parts of the country (Annon, 2016).Gujarat is the fourth largest potato producing states in the country after Uttar Pradesh, Bihar and West Bengal with average yield of 26.30 t ha-1 (Annon, 2015). The yield of potato has been found to vary significantly over the years due to fluctuations in climatic parameters temperature during winter season. Even moderately high temperature drasticallyreduces tuber yield without much affecting the photosynthesis and total biomass production (Singh et al, 2013). the intraseasonal variation in temperature has significant influence on tuber yield of potato. Crop simulation models have been used to study the effect of intra-seasonal variation in weather parameters on yield of wheat crop (Sandhu et al, 2016; Prabhjyot Kaur and Hundal, 2009). In this paper an attempt has been made to assess the effect of intra-seasonal variation in temperatures on tuber yield of potato in middle Gujarat using SUBSTOR potato model
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