نتایج جستجو برای: economic yield

تعداد نتایج: 502176  

2008
M. A. KHAN F. S. BALUCH

A field experiment was conducted to investigate the effect of soil application of zinc fertilizer on yield and yield components of wheat (Triticum aestivum L. cv. Pak-81) grown on calcareous soil in Pakistan. The levels of zinc sulphate were 0 (control), 5, 10, 15, 20, 25 and 30 kg ha and the zinc sulphate was combine-drilled at the time of sowing. Zinc sulphate increased the Leaf Area Index, t...

2008
BRIAN A. NAULT GEORGE G. KENNEDY

J. Econ. Entomol.91 (1): 7-20 (1998) ABSTRACT The relationship between Irish potato tuber yield, So/anum tuberosum L., and defoliation by the Colorado potato beetle, Leptinotarsa decem/ineata (Say), was investigated and the use of regression and mean separation analyses as a basis for developing economic injury levels were compared. The type of statistical analysis used to describe this relatio...

Journal: :به زراعی کشاورزی 0
حسین رضوانی دانشجوی دکترای زراعت، گروه زراعت و اصلاح نباتات، دانَشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران جعفر اصغری استاد گروه زراعت و اصلاح نباتات، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران سید محمدرضا احتشامی استادیار، گروه زراعت و اصلاح نباتات، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران بهنام کامکار دانشیار، گروه زراعت، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

for determination of economic damage threshold of four wheat (triticum aestivum l.) cultivars in different densities of wild mustard (sinapis arvensis l.), experiments were conducted at agricultural research station gorgan during 2010-2012. the experimental design consisted of four randomized complete blocks in a factorial arrangement. the treatments comprised of factorial combination of wild m...

Journal: :Journal of environmental quality 2015
Xin Zhang Denise L Mauzerall Eric A Davidson David R Kanter Ruohong Cai

Technologies and management practices (TMPs) that reduce the application of nitrogen (N) fertilizer while maintaining crop yields can improve N use efficiency (NUE) and are important tools for meeting the dual challenges of increasing food production and reducing N pollution. However, because farmers operate to maximize their profits, incentives to implement TMPs are limited, and TMP implementa...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
M R Schmer K P Vogel R B Mitchell R K Perrin

Perennial herbaceous plants such as switchgrass (Panicum virgatum L.) are being evaluated as cellulosic bioenergy crops. Two major concerns have been the net energy efficiency and economic feasibility of switchgrass and similar crops. All previous energy analyses have been based on data from research plots (<5 m2) and estimated inputs. We managed switchgrass as a biomass energy crop in field tr...

2009
M. Ashrafuzzaman A. K. M. Kamruzzaman M. Razi ismail S. M. Shahidullah S. A. Fakir

Lentinus edodes (Berk.), the shiitake mushroom, is worldwide one of the most widely cultivated mushrooms. Sawdust is the most popular basal ingredient used in synthetic substrate formulations for producing shiitake spawn. However, the best sawdust for this uses needs to be determined. Shiitake mushroom was cultivated on sawdust from the woody plants Babla (Acacia nilotica L.), Champa (Michelia ...

Journal: :چغندرقند 0
سید معین الدین رضوانی مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی همدان عباس نوروزی کارشناس مرکز تحقیقات کشاورزی و منابع طبیعی همدان کامران آذری کارشناس مرکز تحقیقات کشاورزی و منابع طبیعی همدان علی محمد جعفری مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی همدان

estimation of optimum fertilizer rates is needed because of growing economic and environmental concerns. optimum fertilizer rates can be determined by fitting statistical models to yield data collected from n fertilizer experiments. the main goal of this research was to compare and evaluate quadratic, square root, mitscherlich, rectangular hyperbola, linear plus plateau and quadratic plus plate...

2016
Jacob Ulzen Robert C. Abaidoo Nana E. Mensah Cargele Masso AbdelAziz H. AbdelGadir

This study evaluated the symbiotic effectiveness and economic evaluation of Rhizobium inoculants with the objective of recommending the most effective inoculant strain for soybean and cowpea production in Northern Ghana. Field experiments were established in three locations using randomized complete block design with five blocks. A total of four treatments (Legumefix, Biofix, 100 kg N ha-1 and ...

Journal: :تحقیقات مهندسی کشاورزی 0
نادر نادری عضو هیئت علمی بخش تحقیقات فنی و مهندسی مرکز تحقیقات کشاورزی و منابع طبیعی سمنان (شاهرود) علیرضا محمدی عضو هیئت علمی بخش تحقیقات اصلاح و تهیه نهال و بذر مرکز تحقیقات کشاورزی سمنان (شاهرود)

this research was conducted at the shahrood agricultural research center in 1382 and 1383 to study the effect of alternate furrow irrigation on potato yield and its economic evaluation. the experimental design was a randomize complete block design and the treatments were: every furrow irrigation (efi), fixed alternate furrow irrigation (fafi), variable alternate furrow irrigation (vafi), fixed ...

2010

Row-crop agriculture is a major source of nitrous oxide (N2O) globally, and results from recent field experiments suggest that significant decreases in N2O emissions may be possible by decreasing nitrogen (N) fertilizer inputs without affecting economic return from grain yield. We tested this hypothesis on five commercially farmed fields in Michigan, USA planted with corn in 2007 and 2008. Six ...

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