منابع مشابه
Photosynthesis and Biomass Allocation in Oak Seedlings Grown under Shade
Northern’ red oak (Quercus rubra L.) (NRO) and white oak (0. alba L.) (WO) acorns were sown into wooden plots and grown under 30 percent shade screen (30 percent S) or 70 percent shade screen (70 percent S). Seedlings grown under full sun were the controls (C). At the end of the first year, the 30 percent S NRO had 30 percent greater seedling dry weight (DW) than C seedlings. No growth differen...
متن کاملAssessing the Conservation Value of Shade-Grown Coffee: a Biological Perspective using Neotropical Birds
Shade-grown coffee has been marketed as a less intensive management practice that may help improve biodiversity conservation (Perfecto et al. 1996). Studies have shown higher species richness in shade-grown coffee than sun, however, effects on bird species of conservation concern are not clear. This study uses two international conservation lists produced by the World Conservation Union (IUCN) ...
متن کاملProductivity and radiation use efficiency of lettuces grown in the partial shade of photovoltaic panels
Combining photovoltaic panels (PVPs) and crops on the same land unit were recently proposed as an alternative to the conversion of cropland into photovoltaic plants. This could alleviate the increasing competition for land between food and energy production. In such agrivoltaic systems, an upper layer of PVPs partially shades crops at ground level. The aim of this work was to (i) assess the eff...
متن کاملEffect of Potato Virus Y and Tobacco Mosaic Virus on Field - Grown Burley Tobacco
SIEVERT, R. C. 1978. Effect of potato virus Y and tobacco mosaic virus on field-grown burley tobacco. Phytopathology 68: 823-825. Yield, grade index, crop index, value per kilogram, and tobacco had less nicotine and TMV-infected tobacco had less value per hectare were reduced when Burley 37 became a-amino nitrogen, but tobacco infected with TMV+PVY had infected with tobacco mosaic virus (TMV), ...
متن کاملWoody plant diversity and structure of shade-grown-coffee plantations in northern Chiapas, Mexico.
Shade-grown coffee is an agricultural system that contains some forest-like characteristics. However, structure and diversity are poorly known in shade coffee systems. In 61 coffee-growers' plots of Chiapas, Mexico, structural variables of shade vegetation and coffee yields were measured, recording species and their use. Coffee stands had five vegetation strata. Seventy seven woody species most...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1902
ISSN: 0036-8733
DOI: 10.1038/scientificamerican09061902-154