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Seed collected from natural stands of P. menziesii growing at (a) 250, (b) 520 and (c) 880 m alt. in Oregon, and from a cross between trees in (a) and...
Read moreA germination response study using mannitol was conducted in growth chambers. The highest rate of germination in Agropyron smithii (western wheatgrass...
Read moreDM production of swards of Bouteloua gracilis was modelled using measured effects of soil water potential, temperature, visible irradiance and phenolo...
Read moreIn a Swedish experiment, 18-yr-old Scots pine were defoliated by hand in early and late summer, simulating different degrees of insect grazing on the ...
Read moreRelative rate of increase of leaf area per plant was measured in field beans during May-Aug. 1966. In the early stages of growth, until LAI reached ab...
Read moreOf 2 lawns studied one was not fertilized or irrigated and was infrequently cut and the other was fertilized, irrigated and cut weekly. The dominant g...
Read moreOn flat bog with deep peat where heather (Calluna vulgaris), the principal food of the birds, was scarce application of superphosphate, or ground mine...
Read moreAtmospheric pollution in China is mainly caused by human activities such as urbanization and industrialization. Such activities have increased in the ...
Read moreThe great changes in Chinese agriculture during the past 10 years have been accompanied by significant deterioration of the rural environment. Among t...
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