Abstract
Barley is a cool-weather cereal grain primarily produced on dryland farms in Sistan region. In order to study the effect of different proportions of manure and chemical fertilizer and water stress on grain yield and grain nutrient content in barley an experiment was conducted as split plot randomized complete block design with three replications in research field of Zabol University, 2009. Water stress treatments consisted of: water stress in grain filling stage (S1) and control (S2) as the main factor and different proportions of manure and chemical fertilizer treatment consisted of: 100% manure (N1), 100% chemical fertilizer (N2), 50% manure + 50% chemical fertilizer (N3), 75% manure + 25% chemical fertilizer (N4) and control (N5) as sub factor in this experiment. Results illustrated that the effect of drought stress in grain filling stage treatment on all grain yield and yield components with the exception of ear weight, were significant. Drought stress in grain filling stage strongly decreased grain yield but its effect was not very strong on another traits. With the exception of grain number/ear and ear weight, fertilizer treatments had significant effect on grain yields and yield components. Grain nutrient content not affected by water stress but among different proportions of fertilizer treatments, 100% manure (N1) caused to increase of these elements in grain. Key word: Water stress, manure, chemical fertilizer, yield, barley.
Highlights
Drought is perhaps the major factor limiting crop production world-wide (Shangguan et al, 2000) and crops with high drought resistance are crucial for maintaining yield in areas where dry seasons are common
In order to study the effect of different proportions of manure and chemical fertilizer and water stress on grain yield and grain nutrient content in barley an experiment was conducted as split plot randomized complete block design with three replications in research field of Zabol University, 2009
Results illustrated that the effect of drought stress in grain filling stage treatment on all grain yield and yield components with the exception of ear weight, were significant
Summary
Drought is perhaps the major factor limiting crop production world-wide (Shangguan et al, 2000) and crops with high drought resistance are crucial for maintaining yield in areas where dry seasons are common. Borlaug and Dowswell (1994) concluded that 50% of the increase in crop yields worldwide was due to application of chemical fertilizers They stated that during the 21st century, the essential plant nutrients would be the single most important factor limiting crop yields, especially in developing countries. The effort to measure yield response to an applied nutrient is further confounded by other factors, such as variable soil fertility levels, climatic conditions, crop rotations, and changes in production practices that affect nutrient use efficiency (Stewart et al, 2005). Keeping in view the aforementioned facts, this project was designed to determine the effect of water stress and different proportion of manure and chemical fertilizer on some properties of barley and nutrient availability, uptake, transport, and accumulation, interactions between nutrient supply and drought stress response in barley in Sistan region
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