نتایج جستجو برای: crop factor

تعداد نتایج: 908373  

2017
Kulasekaran Ramesh Amar Matloob Farhena Aslam Singarayer K. Florentine Bhagirath S. Chauhan

Whilst it is agreed that climate change will impact on the long-term interactions between crops and weeds, the results of this impact are far from clear. We suggest that a thorough understanding of weed dominance and weed interactions, depending on crop and weed ecosystems and crop sequences in the ecosystem, will be the key determining factor for successful weed management. Indeed, we claim th...

ژورنال: علوم آب و خاک 2018

The most important factor in determining crop water requirement is estimation of evapotranspiration (ET). Majority of the methodsestimate ET apply series of relatively complex formula,which is then used to determine crop evapotranspiration (ETc). The parameters used in aforesaid methods are: Solar radiation, wind speed, humidity, etc. Unfortunately, in Iran and many countries, long-term records...

Journal: :Environmental monitoring and assessment 2008
Shao-Wen Huang Ji-Yun Jin

This study was conducted to determine status of heavy metals in agricultural soils under different patterns of land use. A total of 38, 40 and 45 soil samples for bare vegetable field, greenhouse vegetable field, and grain crop field were respectively taken from surface layer (0-20 cm) from selected experimental areas away from suburbs of ten counties (or districts or cities) in four provinces ...

Journal: :Journal of experimental botany 2002
M H Jeuffroy B Ney A Ourry

Today farmers have several constraints to take into account in managing their crops: (i) competitiveness: productivity must be maintained or increased whereas inputs must be decreased, (ii) the environmental consequences of cultural practices: pesticide and fertilizer use must be decreased, and (iii) product quality must be improved and nitrogen nutrition is an important factor in harvest quali...

Drought induced stress is one of the most significant environmental challenges. This study was designed to evaluate the effects of drought stress on crop yield and antioxidant systems during the vegetative period of wheat. The study was carried out in a greenhouse using factorial experiment based on complete randomized block design (RCBD) in three replications in Razi University in Iran from 20...

2009
Christy W Rose Reginald J Millwood Hong S Moon Murali R Rao Matthew D Halfhill Paul L Raymer Suzanne I Warwick Hani Al-Ahmad Jonathan Gressel C Neal Stewart

BACKGROUND One theoretical explanation for the relatively poor performance of Brassica rapa (weed) x Brassica napus (crop) transgenic hybrids suggests that hybridization imparts a negative genetic load. Consequently, in hybrids genetic load could overshadow any benefits of fitness enhancing transgenes and become the limiting factor in transgenic hybrid persistence. Two types of genetic load wer...

Journal: :علوم گیاهان زراعی ایران 0
محمدرضا جمالی مربی، مرکز تحقیقات کشاورزی و منابع طبیعی فارس - زرقان محمد علی باغستانی دانشیار، بخش تحقیقات علف های هرز مؤسسۀ تحقیقات گیاه پزشکی کشور، تهران لادن جوکار مربی، مرکز تحقیقات کشاورزی و منابع طبیعی فارس - زرقان

in order to study the complementary effects of application time of two herbicides sulfosulfuron 75% wg (apyrus) and 75% sulfosulfuron + 5% metsulfuron-methyl (total) and planting wheat density on wild barley (hordeum spontaneum koch.) control, an experiment was conducted in randomized complete blocks design with two-factors during 2012-2013 growing season in zarghan (fars). the first factor was...

2015
Treenut Saithong Samorn Saerue Saowalak Kalapanulak Punchapat Sojikul Jarunya Narangajavana Sakarindr Bhumiratana Tiratha Raj Singh

Cassava is a crop of hope for the 21st century. Great advantages of cassava over other crops are not only the capacity of carbohydrates, but it is also an easily grown crop with fast development. As a plant which is highly tolerant to a poor environment, cassava has been believed to own an effective acclimation process, an intelligent mechanism behind its survival and sustainability in a wide r...

Journal: :زراعت دیم ایران 0
سید سعید پورداد معاونت موسسه تحقیقات کشاورزی دیم- کرمانشاه مهدی جمشید مقدم معاونت موسسه تحقیقات کشاورزی دیم- کرمانشاه

safflower is an oilseed crop with high adaptability to rainfed conditions of iran. it is native crop in iran and due to some morphological characters specially root system it shows good resistance to drought stress. in present investigation to study genetic variation in fall planting of safflower in rainfed condition 100 genotypes were evaluated in a 10×10 simple lattice square design with two ...

Journal: :Current Biology 2016
Klaus Palme William Teale Alexander Dovzhenko

A new report shows that the HY5 transcription factor moves from shoots to roots in plants, mediating light regulation of root growth and nitrate uptake. This finding offers not only a mechanistic insight into shoot-root communication, but also scope for increasing crop yields.

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