نتایج جستجو برای: crop pattern

تعداد نتایج: 414267  

Journal: :J. Field Robotics 2008
David G. Schmale Benjamin R. Dingus Charles F. Reinholtz

Remote-controlled (RC) unmanned aerial vehicles (UAVs) have been used to study the movement of agricultural threat agents (e.g., plant and animal pathogens, invasive weeds, and exotic insects) above crop fields, but these RC UAVs are operated entirely by a ground-based pilot and often demonstrate large fluctuations in sampling height, sampling pattern, and sampling speed. In this paper, we desc...

2017
SANDEEP SAMANTARAY CHANDRA SWAIN

The designs of Water distribution systems are based on certain objectives such as equity, adequacy to access its efficacy. The design of canal systems for distributing the water is based on the size of command areas. Duration of operation. It is a fact that Odisha is a predominantly agrarian state as more than 2/3rd of the state population depends on agriculture. Irrigation is the paramount imp...

Journal: :راهبردهای توسعه روستایی 0
حامد اسکندری دامنه دانشجوی کارشناسی ارشد بیابان زدایی دانشگاه تهران حسین نوروزی دانشجوی کارشناسی ارشد اقتصاد کشاورزی دانشگاه تهران حسن خسروی استادیار، دانشکده منابع طبیعی دانشگاه تهران حامد رفیعی استادیار اقتصاد کشاورزی دانشگاه تهران عمران طاهری ریکنده دانشجوی کارشناسی ارشد دانشگاه تهران

jazmoryan wetland is one of the most sensitive ecosystems in the south east of the country which is declining due to dam construction in upstream as well as deficiency of environmental water supply. the wetland seem to dry out due to its geographical location and construction of bampour diversion dam and jiroft reservoir dam on major rivers flowing to this wetland. one of the solutions proposed...

Journal: :Turkish Journal of Computer and Mathematics Education 2021

Agriculture plays a significant role in increasing the economic development of our nation. Crop production has greatly affected due to changes weather pattern. Emerging technologies can be used improve productivity crops by converting traditional farming precision farming. The new that are include data analysis and Internet things (IOT). major issue yet resolved is cultivating precise crop at t...

2014
Dafna Ziv Tali Zviran Oshrat Zezak Alon Samach Vered Irihimovitch Takaya Moriguchi

In many perennials, heavy fruit load on a shoot decreases the ability of the plant to undergo floral induction in the following spring, resulting in a pattern of crop production known as alternate bearing. Here, we studied the effects of fruit load on floral determination in 'Hass' avocado (Persea americana). De-fruiting experiments initially confirmed the negative effects of fruit load on retu...

Journal: :Entropy 2017
Lina Hao Xiaoling Su Vijay P. Singh Olusola O. Ayantobo

An integrated optimization model was developed for the spatial distribution of agricultural crops in order to efficiently utilize agricultural water and land resources simultaneously. The model is based on the spatial distribution of crop suitability, spatial distribution of population density, and agricultural land use data. Multi-source remote sensing data are combined with constraints of opt...

2013
Heidi L. Puckett James R. Brandle Ron J. Johnson Erin E. Blankenship

As natural predators of pest insects, woodland birds provide biological pest suppression in crop fields adjacent to woody edges. Although many birds using these habitats forage widely, earlier studies have found that most foraging activity occurs within 50 m of the woody edge. The goals of this study were to determine the primary area of use, or functional edge, for birds foraging in crop field...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Mark S Bulmer Ido Bachelet Rahul Raman Rebeca B Rosengaus Ram Sasisekharan

Insect pests such as termites cause damages to crops and man-made structures estimated at over $30 billion per year, imposing a global challenge for the human economy. Here, we report a strategy for compromising insect immunity that might lead to the development of nontoxic, sustainable pest control methods. Gram-negative bacteria binding proteins (GNBPs) are critical for sensing pathogenic inf...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2011
Insuk Lee Young-Su Seo Dusica Coltrane Sohyun Hwang Taeyun Oh Edward M Marcotte Pamela C Ronald

Rice is a staple food for one-half the world's population and a model for other monocotyledonous species. Thus, efficient approaches for identifying key genes controlling simple or complex traits in rice have important biological, agricultural, and economic consequences. Here, we report on the construction of RiceNet, an experimentally tested genome-scale gene network for a monocotyledonous spe...

1999
Robert E. Evenson

The paper examines effects of agricultural extension on crop yields in Kenya controlling for other determinants of yields, notably the schooling of farmers and agro-ecological characteristics of arable land. The data we use were collected by the Government of Kenya in 1982 and 1990, but the estimation results reported in the paper are based primarily on the 1982 data set. The sample used for es...

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