By A.G. Norman (ed.)
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This paintings has been chosen via students as being culturally very important, and is a part of the data base of civilization as we all know it. This paintings used to be reproduced from the unique artifact, and continues to be as actual to the unique paintings as attainable. accordingly, you will see that the unique copyright references, library stamps (as every one of these works were housed in our most vital libraries round the world), and different notations within the paintings.
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Extra resources for Advances in Agronomy, Vol. 1
Simpson and Weindling (1946), working with many varieties of cotton, found one selection of STONEVILLE t o be resistant. This resistant selection was designated STONEVILLE 20. Since the release of STONEVILLE 20 many workers have used it in transferring resistance to many other varieties of Upland cotton. Blank, a t College Station, Texas, has transferred resistance to the commercially desirable varieties of cotton which are grown in Texas. Other workers in Tennessee, Mississippi, New Mexico, Arizona and California are using STONEVILLE 20 in their breeding programs in order that resistance to bacterial blight may be transferred to the new varieties which are being developed.
The greatest root growth in any experiment was observed t o be with 21 per cent oxygen and 10 per cent carbon dioxide. The elongation of the tap root was similar whether nitrate or ammonium nitrogen was supplied. The absence of carbon dioxide did not affect root growth and 60 per cent of this gas prevented growth. 26 J O H N T. PRESLEY IV. PRESLEY Mississippi Agricultural Experiment Station, State College, Mississippi Cotton disease investigations have been in progress in the cottongrowing areas of the United States since before the turn of the century.
Smith (1948) found that ethylene dibromide (Dow W-40) gave considerable increases in yield when used on wilt-sick soil infested with nematodes. Presley (1949) also obtained consistently high yields from plots treated with ethylene dibromide on wilt-infested soil also infested with root-knot nematodes. Through the use of a simplified method of application and row treat- 32 J . C. GAINES ment rather than blanket application, the chemical control of nematodes is economically feasible. Studies conducted a t the Mississippi Agricultural Experiment Station have shown considerable carry-over effect of the soil fumigant from one year to the next.