Titlebook: Soil Water and Nitrogen in Mediterranean-type Environments; John Monteith,Colin Webb Book 1981 Springer Science+Business Media Dordrecht 1

Truculent

Plant improvement for semi-arid rangelands: possibilities for drought resistance and nitrogen fixat, rough topography, or shallow soils, many of these lands are used primarily as rangelands rather than as croplands (Stoddart .., 1975). Rangelands are an important resource: they have produced, and continue to produce, forages for native and domestic grazing animals. As world population expands, ra

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mercenary

Book 1981and therefore must give high priority to optimising the use of soil water and nitrogen which are considered to be among the main limiting factors to production. To obtain the knowledge to further this aim, and with the help of the United Nations Development Program (UNDP), ICARDA is developing a spe

无效

Rainfed farming systems in the mediterranean region,es in presentday farming systems are the history of population growth and settlement; political developments and the type of relationship with metropolitan centres; forms of land tenure and the role of farmers in the social and political structure; and the growth of urban demand and the degree of commercialisation and specialisation in production.

catagen

Nitrogen and plant production,transport functions. Nucleic acids provide the means for codification, storage and translation of genetic information. In those and other organic materials, nitrogen appears in a chemically reduced state. Such organic nitrogen constitutes 1.5 to 5 per cent of the dry weight of higher plants, and 80 to 90 per cent of that is in protein.

干涉

INCH

Accession, transformation, and loss of nitrogen in soils of the arid region,78; NRC, 1978). Nearly all of the research on nitrogen as a plant nutrient has been conducted in irrigated or humid ecosystems where spectacular improvements in crop yield have been achieved through the use of large amounts of N.

Priapism

a region, and therefore must give high priority to optimising the use of soil water and nitrogen which are considered to be among the main limiting factors to production. To obtain the knowledge to further this aim, and with the help of the United Nations Development Program (UNDP), ICARDA is develo

铁塔等

Epilogue: themes and variations,ithout an input of nitrogen and other elements to replace those removed by harvesting. So it was appropriate at this workshop to consider the processes which determine the availability of nitrogen in agricultural soils as well as the more rapid fluctuations in water supply which are closely linked to the availability of nitrogen.

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