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

By A.G. Norman (ed.)

Show description

Read Online or Download Advances in Agronomy, Vol. 1 PDF

Similar nonfiction_4 books

Work Stress and Coping Among Professionals (Social Sciences in Asia)

According to a large-scale survey, indepth interviews and comparative analyses, this ebook deals deep analyses of labor rigidity and coping between seven expert teams: medical professionals, legal professionals, engineers, nurses, lecturers, cops, and lifestyles assurance brokers. The ebook makes functional thoughts for private, organizational and societal intervention.

Handbook of operation and fught instructions for the models B-26, B-26A, and B-26B bombardment airplanes

Изображения: черно-белые рисункиThis Technical Order l. a. the Operation and Flight directions for the versions and B-26A Bombardment Airplanes. Pilots and different team of workers who're required to appreciate the operation of this aircraft will learn and be conversant in the knowledge contained herein.

Po Valley

Heart of army historical past book seventy two 33. The Po River Valley is in Italy. Describes the Allied forces' offensive within the Po Valley in Northern Italy from April five throughMay of 1945.

Extra info for Advances in Agronomy, Vol. 1

Sample text

The injury to the cotton plant is characterized by an excessive blasting and shedding of small squares, a reduction in the number of fruiting branches, and either a tall whiplike growth of the main stem or an increased number of vegetative branches. Several workers (Gaines, 1933, 1942; Hunter and Hinds, 1904; Reinhard, 1926b) have shown that the fleahopper migrates from horsemint to 34 J. C. GAINES cotton early in the spring and migrates from cotton t o croton early in July. Ewing (1929) and Painter (1930) investigated the possibility of the fleahopper being a vector of a plant disease.

The soil around affected plants was saturated with a 6 per cent solution by flooding or by pressure methods. Clean fallow, followed by deep tillage and rotation with nonsusceptible crops, is effective in reducing the disease, particularly in Texas. McNamara and Hooton (1930) state that, in a plot where more than 90 per cent of the plants were infected from 1919 to 1921 inclusive, no diseased plants were found after a 2-year continuous fallow. Numerous types of barriers have been developed to check the spread of the disease.

The level of starch and dextrin decreased with increased nitrate supply. , boll retention) depends on carbohydrate supply. Experiments by Eaton and Rigler (1945) were conducted with the objective of learning whether in cotton there are particular relations between nitrogen and carbohydrate levels that are conducive or nonconducive to fruitfulness. Plants were grown in sand cultures supplied with 1, 4, 16, and 64 meq. nitrate per liter: (1) in a greenhouse in the winter where daily maximum light intensities were arranged to average about 1000 foot-candles, and (2) freely exposed outdoors in the summer where the light averaged about 10,000 foot-candles at midday.

Download PDF sample

Rated 4.09 of 5 – based on 5 votes