نتایج جستجو برای: water use productivity
تعداد نتایج: 2281676 فیلتر نتایج به سال:
Understanding the relationship between photosynthesis, net primary productivity and growth in forest ecosystems is key to understanding how these ecosystems will respond to global anthropogenic change, yet the linkages among these components are rarely explored in detail. We provide the first comprehensive description of the productivity, respiration and carbon allocation of contrasting lowland...
this research was designed to evaluate and compare the applicability of two different types of irrigation including traditionally (surface irrigation) and simple sub-surface drip irrigation (using pricked-pipe covered with plastic cloth). two plots containing 39 pistachio trees with 720 m2 area were selected in rafsanjan, iran. both plots were irrigated using exactly the same quantity and quali...
This paper concerns the simulation of (mostly) Net Primary Productivity for a sample of Chinese ecosystems. More importantly, however, it attempts to disentangle the impacts of changing light-use and water-use efficiency on the responses to environmental forcings. This is a promising idea, but the paper is unconvincing in it’s attempt to analyze and communicate how and why the models differ in ...
In our globalizing world, the geographical locations of food production and consumption are becoming increasingly disconnected, which increases reliance on external resources and their trade. We quantified to what extent water and land constraints limit countries’ capacities, at present and by 2050, to produce on their own territory the crop products that they currently import from other countr...
in order to study of deficit irrigation levels on wheat grain yield cultivars based on water productivity indices, an experiment was conducted in a split plot arrangement in randomized complete block design at the field of agricultural and natural resources center of isfahan (kabutarabad research station). three levels of irrigations: 60% of full irrigation (f1) and 80% full irrigation (f2) and...
The Green Revolution in India has achieved self-sufficiency in food production. However, in the state of Haryana this has resulted in continuous environmental degradation, particularly of soil, vegetation and water resources. Soil organic matter levels are declining and the use of chemical inputs is intensifying. Newly introduced crop varieties have been responsive to inputs but this has necess...
Quinoa is one of the most nutritious grains and currently has attention due to its adaptation a wide range environments abiotic stresses. This study was conducted under field conditions an arid agro-ecosystem evaluate response physiological yield nineteen elite quinoa genotypes grown three water regimes (95, 65, 35% Field capacity) using drip system in sandy soil. The experiment design split-pl...
Effective water and nitrogen (N) management strategies are critical for sustainable agricultural development. Lysimeter experiments with two deep percolation rates (low high percolation, i.e., LP HP: 3 mm d−1 5 d−1) five N application levels (N0~N4: 0, 60, 135, 210 285 kg ha−1) were conducted to investigate the effects of controlled drainage on productivity (WP) use efficiency (NUE) in water-sa...
The Green Revolution in Haryana has achieved much progress in agricultural productivity but at the cost of land and water degradation. Intensive agriculture during the Green Revolution period has brought continuous environmental degradation, particularly of soil, vegetation and water resources due to the use of high doses of fertilisers and pesticides. The adaptation of various modern agricultu...
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