Showing papers in "Soil Science in 1941"

A pressure-membrane extraction apparatus for soil solution

Abstract: The composition of the soil solution has been given considerable attention in connection with soil fertility and soil salinity investigations, and a number of different methods have been used for sampling the soil solution. It is the purpose of this paper to review briefly these methods and to present preliminary results on a new experimental procedure which gives promise of being useful for studying physical as well as chemical properties of the soil solution over the plant growth range of moisture contents.

The Biochemistry of Symbiotic Nitrogen Fixation

Abstract: When Sir John Boyd Orr, famous English agricultural economist, was asked to deliver the 1934 Chadwick Lecture at the Rowelt Institute in Aberdeen, he chose for his subject “The National Food Supply and Its Influence on Public Health." This is, he said, "in some respects the most important political and social question of the present day. In the interests of agriculture, measures affecting our food supply have been taken by the present Government. These measures affect not only the farmer. As the y may determine the amount of food, they have a bearing on public health and social services and so affect every member of the community." He Might have added that even in his twentieth century we have not succeeded in ridding the world of the specter of starvation, which terrified the populations of past centuries. Although we have, with advances in scientific agriculture, increased food production per unit area three-to fivefold, and we talk much of overproduction and surpluses, a large part of the population, in the lower income groups still cannot afford an adequate diet.

The soils that support us

Abstract: The soils that support us , The soils that support us , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی