نتایج جستجو برای: water yield production function

تعداد نتایج: 2374078  

2017
Jiayin Pang Neil C. Turner Yan-Lei Du Timothy D. Colmer Kadambot H. M. Siddique

Drought, particularly terminal drought, reduces the yield of chickpea (Cicer arietinum L.). Terminal drought tolerance and water use patterns were evaluated under controlled conditions in 10 genotypes of desi chickpea. Withholding water from early podding reduced vegetative growth, reproductive growth, seed yield, and water use efficiency for seed yield in all genotypes. The genotype Neelam, wh...

A.R. Sepaskhah M.M. Maharlooei S.M. Nassiri

ABSTRACT- Maize production, which is ranked after wheat and barely in Fars province, Iran, needs a considerable amount of irrigation water that is not available in scarce water conditions in drought situations. Therefore, proper planting method can improve irrigation water management. The objectives of the present study were to investigate the effects of two planting methods, on-bed and in furr...

Journal: :علوم گیاهان زراعی ایران 0
افشین توکلی علی احمدی هوشنگ علیزاده

drought stress is a major factor limiting crop production. investigation of physiological characteristics related to drought tolerance and crop production may be useful in selecting drought tolerant cultivars as well as in improving crop yield. two drought tolerant (azar2 & back cross roshan) and two drought susceptible (marvdast & shiraz) cultivars were investigated in both greenhouse and fiel...

Journal: :پژوهش های زراعی ایران 0
جلیل اصغری میدانی اسماعیل کریمی

increases forage production and economic production in rainfed condition requires attention to agricultural issues such as determination of appropriate sowing depth. so in order to determine the effect of different sowing depths of vetch this experiment was conducted in agricultural research station of maragheh as strip plot based on randomized complete block design with three species of vetch ...

Addressing deficit irrigation scheduling (DIS) for strategic crop production (especially wheat) under precipitation uncertainty is a priority for irrigation scheduling in drought conditions. This research investigated the precipitation uncertainty by enacting optimistic and pessimistic scenarios for the next 20 years by considering the statistical record of climate in Badjgah area. DIS was cond...

A. Shabani A.A Kamgar-Haghighi A.R. Sepaskhah,

Shortage and salinity of irrigation water are two major constraints that influence rapeseed production in arid and semi-arid regions of central and southern Iran. In this study, effects of deficit irrigation with different salinity levels and planting methods (in-furrow and on-ridge) as strategies for coping with water and salinity stresses on yield and yield quality of rapeseed were invest...

D. Yared H. Tilahun H. Watanabe T. Kassu,

Poor irrigation water management is one of the major factors limiting crop production inEthiopia. This study was, therefore, conducted at three different locations in the southeasternEthiopia for 2 consecutive years to investigate the effects of different irrigation depths andintervals with furrow irrigation system on tuber yield, biomass yield and water use efficiency ofpotato. The treatments ...

محبی, محمود , نجفی علیشاه, فریبا , گلچین, احمد ,

Lack of sufficient water resources and drought stress is one of the main problems for crop production in arid and semi-arid regions of the world, such as Iran. The use of water absorbing polymers (hydrogels) improves water retention capacity of soils and can lead to optimal use of the restricted water resources. In this research, the effects of four levels of Aquasorb water-absorbing polymer (0...

2014
Yangquanwei Zhong Zhouping Shangguan

Water shortage and nitrogen (N) deficiency are the key factors limiting agricultural production in arid and semi-arid regions, and increasing agricultural productivity under rain-fed conditions often requires N management strategies. A field experiment on winter wheat (Triticum aestivum L.) was begun in 2004 to investigate effects of long-term N fertilization in the traditional pattern used for...

Journal: :محیط شناسی 0
تورج نصرآبادی استادیار گروه برنامه ریزی، مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران الهام عرب کارشناس ارشد برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران فرزام پوراصغر سنگاچین دکترای برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران

introduction the average annual precipitation in iran is about 250 mm that is not regularly distributed spatially and temporally. more than 70 percent of total precipitation is not accessible due to evapotranspiration. total renewable water resources of the country are estimated to be around 130 billion cubic meters. in spite of limitation in water resources, they are not used properly. agricul...

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