Download Advances in Agronomy, Vol. 1 by A.G. Norman (ed.) PDF

By A.G. Norman (ed.)

Show description

Read or Download Advances in Agronomy, Vol. 1 PDF

Best nonfiction_4 books

Free Will and Determinism in Joseph Conrad's Major Novels. (Internationale Forschungen Zur Allgemeinen & Vergleichenden Literaturwissenschaft)

Even though it has usually been mentioned that the protagonists of Joseph Conrad's novels often fail in what they try and in achieving, the forces that oppose them have infrequently been tested systematically. moreover, no sustained makes an attempt were made to scrupulously tackle the primary philosophical factor the characters' crisis increases: that of the freedom-of-the-will.

Extra resources for Advances in Agronomy, Vol. 1

Example text

Various causes for the disease were suggested, such as certain chemical or physical conditions of the soil, an excess of humic acid, an excess of lime, an excess of sulfuric acid, insufficient drainage, or an impervious stratum of clay or limestone underlying the plants that arrested the growth of the taproots. Pammel (1889) isolated the causal organism from diseased cotton plants and definitely established the fact that root rot is caused by a fungus. A series of experiments was then set up t o determine whether COTTON 27 the disease organism was seed borne, and to find methods of control.

Pammel (1888) reported that the root-rot disease of cotton was caused by a fungus and was not a result of unfavorable soil conditions or of chemicals or other materials in the soil, Atkinson (1892) reported that cotton wilt was caused by a vascular-invading Fusarium. Orton (1900) was the first t o breed for wilt resistance in Upland cotton (Gossypium hirsutum) and produced two wilt-resistant varieties, DILLON and DIXIE. Since these early disease investigations in cotton, numerous workers have studied the various diseases attacking the cotton plant and have made notable contributions to an understanding of the disease problems and to methods of control.

Pammel (1888) reported that the root-rot disease of cotton was caused by a fungus and was not a result of unfavorable soil conditions or of chemicals or other materials in the soil, Atkinson (1892) reported that cotton wilt was caused by a vascular-invading Fusarium. Orton (1900) was the first t o breed for wilt resistance in Upland cotton (Gossypium hirsutum) and produced two wilt-resistant varieties, DILLON and DIXIE. Since these early disease investigations in cotton, numerous workers have studied the various diseases attacking the cotton plant and have made notable contributions to an understanding of the disease problems and to methods of control.

Download PDF sample

Rated 4.47 of 5 – based on 45 votes