The cereal-based intensive cropping practices have posed the yield at a plateau and reduced the energy use efficiency (EUE) of the cropping systems in the Indo-genetic plains (IGPs). The long-term cropping systems experimentations with 4 diversified legumes and cereal cropping systems and a grassland fallow system were studied for >10 years representing different agro-ecological regions at the agricultural research farm, IAS, BHU-Varanasi, Uttar Pradesh of IGPs to assess their impacts on system productivity and energy use efficiency. Out of 4 cropping systems viz, Pigeon pea-Pigeon pea (PP-PP) and Rice-Maize (R-M) systems were managed as conventional cultivation running under the breeding project, however; Dryland Rice-Lentil (R-L) and Zero-till Rice-Wheat (R-W) systems were running under agronomy project. The grassland fallow system was maintained in the agronomy block. The maximum system productivity was seen in the zero till rice-wheat (8185 kg ha-1) system and the lowestpigeon peanpea- pigeonpea system (1615 kg ha-1). However, the maximum EUE was found in pigeonpea system (13.23 MJ ha-1) and the lowest in the zero till rice-wheat system (8.88 MJ ha-1). The study suggests that the inclusion of legumes in the cropping system is vital in enhancing the system productivity and energy use efficiency than the long-term cereal-based system in long-run to the alluvial soils of IGPs.
The central-west Terai region is one of the major production domains of wheat in Nepal; however, its yield over the past three decades has been greatly affected by climate anomalies such as fluctuating temperatures, decreased solar radiation and rainfall. NASA-POWER derived weather data of Taulihawa in Kapilbastu (27.55° N, 83.667° E) district in central Terai for the past 32–33 years (1984/85 - 2017/18) were purposively selected and downloaded and validated with recorded weather data (1985/86, 1995/96, 2005/06 and 2015/16) of Department of Hydrology and Meteorology (DHM). The trend analysis for grain yield of wheat yield in Kapilvastu was drawn with the historical data of maximum and minimum temperatures and rainfall. Positive correlations between grain yields and minimum temperature and rainfall each showed an acceptable coefficient of determinations (R2). The Cropping system Model - Crop Environment Resource Synthesis (CSM-CERES)- Wheat model, embedded in Decision Support Systems for Agro-technology Transfer (DSSAT) ver 4.7 was used for multi-year predictions of wheat yields using both historically recorded and simulated climatic scenarios. Model simulated results closely agreed with the observed wheat yields recorded by the Ministry of Agriculture and Livestock Development (MoALD) in Nepal. The correlation coefficient of minimum temperature and wheat yield was 0.272 (p<0.05). The correlation between precipitation and observed and DSSAT simulated wheat yield were 0.379 (p<0.01). The multi-year predicted wheat yields using the historical weather data and by the use of the International Panel on Climate Change (IPCC, 2007) scenario embedded in DSSAT crop model showed that yield of wheat could be sustained with use of the current crop cultivars only for 2050 scenarios. Agro-climatic index, mainly temperature, was found to be more sensitive to wheat production in the Nepalese central-west Terai region. This study suggests for the development of new temperature and drought tolerant ready wheat cultivars to feed the increasingly growing Nepalese population.
Wheat is the major staple cereal crop of the world population. In developing countries like Nepal, cultivation of wheat is dependent upon the monsoon and the irregular monsoon gives way to the drought condition. The studies and researches of recent years have found pronounced effect of drought on the wheat production. The drought stress in crop leads to several changes in the physiological, morphological and biochemical traits leading to the economic losses. The morphological changes can be viewed through two ways as change in shoot and root system such as effect on plant height, leaf senescence, flowering and so on. Similarly, physiological changes involve change in cell growth pattern, chlorophyll content, photosynthesis disturbance and biochemical changes occur in concentration of different chemicals and activity of different enzymes, hence resulting alteration in the natural processes in different phenological stages of wheat. To reduce the effect of drought stress, various approaches have been made but the more focus has been given in the identification of traits that yields high rather than introducing those traits which show better responses towards environmental irregularities. This review study is done to assess the various changes in characters of wheat due to drought and their effect on the crop yield and productivity.
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