نتایج جستجو برای: crop
تعداد نتایج: 68120 فیلتر نتایج به سال:
Jae Sun Moon and Richard G. Allen, Department of Crop Sciences, University of Illinois, 1102 South Goodwin Ave., Urbana 61801; Leslie L. Domier, Department of Crop Sciences, University of Illinois, 1102 South Goodwin Ave., Urbana 61801 and U.S. Department of Agriculture, Agricultural Research Service, Crop Protection Research Unit, 1102 South Goodwin Ave., Urbana, IL 61801; and Adriana D. Hewin...
First, experiments were tested for a new method concerning analyses of crop contents in liquosomatophagous animals. Disc-electrophoretic separations of the crop contents of Helobdella stagnalis yielded protein patterns typical for the number of bands and for the relative mobilities in these Chironomid larvae, on which H. stagnalis were fed. Additionally, slowly migrating bands occurred in the s...
The recent years' problems of herbicide use have led a growing number of researchers to seek alternative methods that are less reliant on herbicides. This research was conducted to determine the effect of long-term crop rotation, mineral fertilizer and herbicide on the weed infestation and grain yield of winter rye during 2004 and 2005 at the long-term experimental site of the University of Tim...
Scarcity of conventional water resources and high volume of wastewaters have increased the important role of crop residues to reduce evaporation from soil surface and optimal use of water, especially in greenhouse cultivation. In the present research, the impact of crop residues and fishery’s wastewater on yield, qualitative characteristics and water productivity of cherry tomato was stud...
Crop yield prediction has an important role in agricultural policies such as specification of the crop price. Crop yield prediction researches have been based on regression analysis. In this research canola yield was predicted using Artificial Neural Networks (ANN) using 11 crop year climate data (1998-2009) in Gonbad-e-Kavoos region of Golestan province. ANN inputs were mean weekly rainfall, m...
One of the remaining methodological challenges of agricultural LCAs is the inclusion of crop rotation effects. They are caused by changes in physical, chemical and biological properties of the agricultural land over time (e.g. soil structure, presence and availability of nutrients, phytosanitary conditions) and cannot be easily measured. LCA studies, focusing on only one vegetation period, have...
Agriculture is one of several industries that face criticism today because of its impact on the environment. Pollution prevention technologies can go a long way toward addressing these concerns. They could also be beneficial to producers as they represent a move toward efficiency. The most common environmental pollutants from crop production are sediment, nutrients, and pesticides. This paper i...
For use in an Internet application on whole farm modelling we needed to determine a reasonable crop rotation given only the crops in the rotation and the number of hectares of each crop. The crop rotation problem considered in this paper is therefore that of determining hectares of precrops for each crop. Crop rotation modelling in general is traditionally done by using linear programming. In t...
An improved crop rows detection presented based-Hough transform. In the paper, the two argument r q 、 of peaks in Hough space were mapped into the Cartesian coordinate system to extract straight line segments fitting the crop rows, in which the template matching was firstly designed to filter the noises from isolated, or scattering points, then the weighted averaging were employed to eliminate ...
A field crop irrigation management decision-making system (CropIrri) was developed based on the soil water balance model, crop phenology model, root growth model, crop water production function, and irrigation management model. The irrigation plan is made through predicating of soil water content in root zone and daily crop water requirement using historical and forecasting weather data, measur...
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