Article

Inter-Relationships Between Yield And Yield Attributes Of Potato Grown Under Supra-Optimal Ambient Temperatures

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Abstract

Forty eight potato genotypes were evaluated in Saminaka (Lat. 100 27’N and Long 40E, Mean Min. Temp 25oC, Mean Max Temp 31.5oC) during the rainy season of 1999 and 2000 to determine the inter-relationship between yield and some important agronomic traits in the potato grown under high ambient temperatures. The genotypes were laid out in a randomized complete block design with three replications. The genotypes exhibited highly significant variability (P<0.01) for all traits assessed. Tuber yield was positively associated with number of stems/plant (r = 0.246, P<0.05); plant height (r = 0.206, P<0.05); and number of leaves/plant (r = 0.237, P<0.05). Both the correlation and regression of yield on days to tuber initiation and days to maturity were negative and significant. This suggests that earliness in tuber initiation and maturity led to increased yield under supra optimal temperature probably due toreduced period of exposure to heat stress. Number of tubers per plant (R2 = 0.383) and average tuber weight per plant (R2 = 0.125) had the highest coefficients of determination of yield and by far the highest direct effects on yield (87.5% and 66.9%respectively) when compared to other attributes suggesting that they were the major contributors to yield under supra-optimal temperature conditions and may be relied upon in selecting for improved yield under such conditions.

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... Potatoes are a major crop in Egypt and contribute immensely to human nutrition and food security (Karim, et al., 2010). The weather conditions during growing seasons and farm management are considered one of the most important constrains on the ability to increase production (Amadi, et al., 2009). There are three major cultivation seasons for potato in Egypt; Summer season cultivated during December and January, Nili season cultivated during late September and early October and winter season cultivated during late October and early November. ...
... There are three major cultivation season for Potato in Egypt: Summer season cultivated during December and January; Nili season cultivated during late September and early October and winter season cultivated during late October and early November. The weather conditions during growing season and farm management are considered one of the most important constrains on the ability to increase production Amadi et al (2009). ...
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ABSTRACT In support of research to predict the impact of climate change on reference evapotranspiration (ETo) in Egypt, this study investigates the projected changes in evapotranspiration in Egypt, with a focus on the Delta, Middle and Upper Egypt. The maximum and minimum temperature were statistically downscaled and compared with a current climate, defined as the period 1971–2000. FAO-56 Penman-Monteith equation was used to estimate ETo by using the climatic data. Evapotranspiration is estimated based on the predicted maximum and minimum using the RCPs scenarios (RCP3.0 – RCP4.5 – RCP6.0 and RCP8.5) during three time series (2011-2040, 2041-2070 and 2071-2100). The obtained results revealed that the maximum and minimum air temperatures were increased under all RCPs scenarios compared to current data. Moreover, the RCP8.5 had the highest maximum and minimum air temperature compared to the other RCPs scenarios. It was found that for all future periods the annual evapotranspiration will increase for the all agro-meteorological zones by uneven values. The main results in this study revealed that ETo significant increase in different tested time series compared to current ETo values. The values of ETo in long term (2071-2100) were higher than short (2011-2040) or mid-term (2041-2070) with respect to the current situation. The highest ETo values was predicted in this study by RCP8.5 during the 2071 – 2100 time series in the Upper Egypt region. The estimation of water requirements for potato crops in different agro-climatic zone show that winter season had the highest cultivated area with potato followed by summer season. Upper Egypt region has the lowest cultivated area of potato during different cultivation season. Total water requirements (WR) for potato during the different cultivating seasons revealed that WR will increase under all scenarios in comparison with the current conditions. The highest water use efficiency was recorded in the Upper Egypt climatic zone during the winter season at 2012. Winter season gave the highest water use efficiency under (WUE) current and future conditions. Moreover, all RCPs scenarios had lower WUE than the current conditions during different time series. Regardless of the seasons, the RCP8.5 gave the lowest WUE in comparison with the other RCPs scenarios. 1372 | P a g e 3 0 S e p t e m b e r 2 0 1 5 w w w. g j a r. o r g
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