Performance of wheat (Triticum aestivum) varieties under different thermal regimes and N-levels

Abstract

Present study was carried out during rabi 2015-16 and 2016-17 at SKUAST-Jammu to evaluate the performance of different varieties of wheat (Triticum aestivum L.) under thermal regimes and N-levels in terms of agrometerological indices like accumulated growing degree days (AGDD), heliothermal units (AHTU), photothermal units (APTU), heat use efficiencies (HUE) of grain and biological yields. The treatments comprised of three wheat varieties (HD 2967, RSP 561 and WH 1105) planted in three sowing environments 25th October (early), 14th November and 4th December with three levels of nitrogen (100, 125 and 150 kg/ha) in split split plot design. Among the varieties, WH 1105 recorded significantly higher AGDD, AHTU, APTU and HUE than HD 2967 and RSP 561. Early sowing (25th October) of wheat also recorded higher AGDD, HTU, PTU and HUE values and grain and biological yield HUE than normal (14th November) and late sowing (4th December) environments. Delayed planting resulted in the reduction of accumulation of thermal indices along with HUE. Fifty kg higher nitrogen (150 kg/ha) than recommended dose (100 kg/ha) exhibited higher agrometerological indices values along with higher HUEs. The relationship between grain and biological yield with AGDD and HUE was highly significant during both the years under experimentation.

Effect of Different Thermal Regimes and Moisture Levels on the Growth Parameters of Wheat (Triticum aestivum L.) Crop Grown under Agro-climatic Conditions of Eastern Uttar Pradesh, India

“…However, by adjusting the sowing period of crop, the negative effects of temperature stress on crop development and yield can be mitigated [4]. Main ecological manipulations that support maintaining existing crop production levels include selecting a variety that meets the best thermal requirements and delaying or advancing the sowing date [5,6]. The unfavorable conditions caused by high temperatures, particularly during the grain filling stage, can be reduced by determining the sowing process to an ideal period for various varieties that are appropriate for early, normal, and late sowing environmental conditions with an assured higher yield.…”

EFFECT OF AGRONOMIC MANIPULATIONS AND THEIR INTERACTIONS ON YIELD, SOIL FERTILITY AND NUTRIENT UPTAKE IN DIFFERENT VARIETIES OF WHEAT UNDER IRRIGATED CONDITIONS OF J&K UNION TERETORY, INDIA

“…Delay in sowing by each day causes a remarkable yield loss in wheat according to various field experiments (Ortiz-Monasterio et al, 1994) which was largely due to terminal heat stress. Adequate growth and augmentation of crop could be obtained by adjusting the sowing environments which leads to better yield; as perfect sowing environment exploits the full genetic potential of a particular variety by providing optimum growth conditions such as temperature, light, humidity and rainfall (Gupta et al, 2020). The unfavourable environments created by high temperature mostly during reproductive stages especially grain filling stage could be minimized by adjusting the sowing time to an optimum time for different varieties, which are suitable for early, normal and late sown environmental conditions for assured higher yield (Gupta et al, 2020a;Gupta et al, 2022).…”

“…The accumulated temperature is considered as the principal factor affecting year-to-year variation in phenology (Gupta et al, 2021). The optimum sowing time and selection of improved cultivars play a remarkable role in exploiting the yield potential of the crop under particular agro-climatic conditions (Gupta et al, 2020).…”

“…A perfect sowing environment exploits the full genetic potential of a particular variety by providing optimum growth conditions such as temperature, light, humidity and rainfall. Advance or delay in sowing date, increasing N application and choice of suitable variety with the best thermal requirement represent the main agronomic manipulations which help to maintain existing crop production levels (Ventralla et al, 2012;Gupta et al, 2020). The unfavourable environments created by high temperature mostly during reproductive stages especially grain filling stage could be minimized by adjusting the sowing time to an optimum time for different varieties, which are suitable for early, normal and late sown environmental conditions for assured higher yield (Gupta et al, 2020a).…”

Adaptation Strategies for Optimum Sowing of Wheat Varieties and Validation Through Ceres-Wheat Model In Changing Climatic Conditions Under Shivalik Range of N-W Himalayas

“…Delay in sowing by each day causes a remarkable yield loss in wheat according to various field experiments (Ortiz-Monasterio et al 1994) which was largely due to terminal heat stress. Adequate growth and augmentation of crop could be obtained by adjusting the sowing environments which leads to better yield; as perfect sowing environment exploits the full genetic potential of a particular variety by providing optimum growth conditions such as temperature, light, humidity and rainfall (Gupta et al 2020). The unfavourable environments created by high temperature mostly during reproductive stages especially grain filling stage could be minimized by adjusting the sowing time to an optimum time for different varieties, which are suitable for early, normal and late sown environmental conditions for assured higher yield (Gupta et al 2020a).…”