نتایج جستجو برای: Actual yield

تعداد نتایج: 317786  

2016
Marc Destefano Wayne D. Gray

In complex task domains, such as games, students may exceed their teachers. Such tasks afford diverse means to tradeoff one type of performance for another, combining task elements in novel ways to yield method variations and strategy discoveries that, if mastered, might produce large or small leaps in performance. For the researcher interested in the development of extreme expertise in the wil...

M. Bannayan M. Nassiri Mahallati M. Parsa R. Deihimfard S.R. Amiri Deh Ahmadi,

Yield gap analysis provides an essential framework to prioritize research and policy efforts to reduce yield constraints. To identify options for increasing chickpea yield, the SSM-chickpea model was parameterized and evaluated. The model was applied to analyze seed yield at both potential and water limited production levels and subsequently to find the yield gap for nine different locatio...

Journal: :بوم شناسی کشاورزی 0
سیدرضا امیری ده احمدی مهدی پارسا محمد بنایان اول مهدی نصیری محلاتی

yield gap analysis provides an essential framework to prioritize research and policy efforts aimed at reducing yield constraints. to identify options for increasing chickpea yield, the ssm-chickpea model was parameterized and evaluated to analyze yield potentials, water limited yields and yield gaps for nine regions representing major chickpea-growing areas of razavi khorasan province. the aver...

In this study, yield-water and profit function was used to obtain water demand function in agriculture sector. The results showed that the ratio of actual to potential Evapotranspiration had positive, significant effecton the ratio of actual to potential yield for wheat and barley. Also, square ratio of actual to potential Evapotranspiration had negative, significant relationship. After estimat...

A. Soltani H. Ajamnoroozi M. Yousefian S. Dastan

The documentation process is very important for identifying yield constraint factors and yield gap. For this purpose, all managing practices were recorded by monitoring of paddy rice fields in Sari region, Iran from 2015 to 2016. Field identifications were undertaken in such a way that they included all the main production procedures with variations in management viewpoints. The results reveale...

Journal: :پژوهش های تولید گیاهی 0
نسیم مقدادی دانشجوی سابق کارشناسی ارشد اگرواکولوژی گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی گرگان افشین سلطانی استاد گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی گرگان بهنام کامکار دانشیار گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی گرگان امیر حجارپور دانشجوی دکتری اکولوژی گیاهان زراعی، گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی گرگان

it is essential to understand crop yield potentials and exploitable gaps to detect yield constraints of crops. yield gap analysis is a method to evaluate our systems distance from actual capability of a region to produce a given crop which will direct researches and help for cropping patterns design and programming. moreover, knowledge on a region capability could result in investigating on giv...

Journal: :international journal of agricultural management and development 2015
zahra ghaffari moghadam

in this study, yield-water and profit function was used to obtain water demand function in agriculture sector. the results showed that the ratio of actual to potential evapotranspiration had positive, significant effecton the ratio of actual to potential yield for wheat and barley. also, square ratio of actual to potential evapotranspiration had negative, significant relationship. after estimat...

ژورنال: علوم زراعی ایران 2019
Dastan, Salman, Rezvantalab, Nasibeh, Soltani, Afshin,

One of the main problems for rice production is the large difference between farmers' actual yields and attainable yields. Therefore, it is important to identify the limiting factors on yield and yield gap. In this research, all performed management practices from seedbed preparation to harvesting in 228 paddy fields of local rice cultivars in the east, central and west parts of Mazandaran prov...

Journal: :تولید گیاهان زراعی 0
علی نخ زری مقدم عضو هیات علمی/ دانشگاه گنبد کاووس علی راحمی کاریزکی عضو هیات علمی دانشگاه گنبد کاووس

background and objectivesintercropping or simultaneous growing of two or more crops on the same piece of land has the potential of enhanced ecosystem productivity. in a cereal-legume intercropping system, an increase in cereal and a decrease in legume intercrop yield is reported. several indices such as land equivalent ratio (ler), relative crowding coefficient (k), competitive ratio (cr), aggr...

One of the main problems in crop production in Iran is the difference between actual yield and attainable yield which is called yield gap. Thus, identifying yield constraints and yield gap are important. Therefore, a study was conducted in 60 farms in Parsabad Moghan, during 2013-14 and 2014-15 crop years using Comparative Performance Analysis (CPA). In this study, several attributes related to...

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