نتایج جستجو برای: spring crops
تعداد نتایج: 91186 فیلتر نتایج به سال:
Wild pollinators have been shown to enhance the pollination of Brassica napus (oilseed rape) and thus increase its market value. Several studies have previously shown that pollination services are greater in crops adjoining forest patches or other seminatural habitats than in crops completely surrounded by other crops. In this study, we investigated the specific importance of forest edges in pr...
The spotted cutworm, Xestia c-nigrum (L.), is highly polyphagous (Tietz 1972) and is a widespread pest of numerous crops in temperate regions of North America, Asia and Europe. It is noteworthy for its early spring damage to leaf and flower buds. The spotted cutworm is a significant pest of several crops in the Yakima Valley of eastern Washington state and causes occasional economic damage to v...
A 2002 Prince Edward Island (PEI) Agricultural Crop Rotations (ACR) Act and other sustainable land use policies regulate what crops can be grown in rotation with potatoes, and the frequency and sequence of specific crops in such rotation systems. Given that there are alternative crops that may be rotated with potatoes and managed for various rotation lengths, the policies raise questions about ...
The proliferation of digital cameras co-located with eddy covariance instrumentation provides new opportunities to better understand the relationship between canopy phenology and the seasonality of canopy photosynthesis. In this paper we analyze the abilities and limitations of canopy color metrics measured by digital repeat photography to track seasonal canopy development and photosynthesis, d...
Winter crops, having high yields in comparison with spring determine the overall grain harvest, thereby providing significant contribution to strengthening country's food security. But at same time, climatic metamorphoses of recent years seriously affect preliminary forecast amount collected products and its final result. Therefore, problem current control over safety cereals cultivated using t...
The paper presents species richness and composition of arable weed vegetation in the region West Bohemia (Czech Republic) different types farming (conventional organic) grown crops (winter spring cereals, wide-row crops). During field survey years 2007 to 2017, 105 phytocoenological relevés were recorded. average one relevé was significantly higher organic farming, as well total cover. lowest f...
Understanding how producers make decisions to allot acreage among crops and how decisions about land use are affected by changes in prices and their volatility is fundamental for predicting the supply of staple crops and, hence, assessing the global food supply situation. The innovations of the present paper are estimates of monthly (i.e. seasonal) versus annual global acreage response models f...
In intensive farmland habitats, pollination of wild flowers and crops may be threatened by the widespread decline of pollinators. The honey bee decline, in particular, appears to result from the combination of multiple stresses, including diseases, pathogens, and pesticides. The reduction of semi-natural habitats is also suspected to entail floral resource scarcity for bees. Yet, the seasonal d...
A procedure named CROPCLASS was developed to semi-automate census parcel crop assessment in any agricultural area using multitemporal remote images. For each area, CROPCLASS consists of a) a definition of census parcels through vector files in all of the images; b) the extraction of spectral bands (SB) and key vegetation index (VI) average values for each parcel and image; c) the conformation o...
Banker plants with Aphidius colemani Viereck were tested in greenhouses in Massachusetts and New York for control of cotton aphid Aphis gossypii Glover, and green peach aphid Myzus persicae (Sulzer) on 2 spring flower crops, pansies ( Viola tricolor hortensis ) and Marguerite daisies ( Argyranthemum hybrid). Banker plants consisted of pots of barley plants infested with the bird cherry-oat aphi...
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