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Book Effects of Alfalfa Crop Sequence and Tillage Practice on Intake Rates of Pullman Silty Clay Loam and Grain Yields

Download or read book Effects of Alfalfa Crop Sequence and Tillage Practice on Intake Rates of Pullman Silty Clay Loam and Grain Yields written by Marvin E. Jensen and published by . This book was released on 1965 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effects of Alfalfa Crop Sequence and Tillage Practice on Intake Rates of Pullman Silty Clay Loam and Grain Yields Classic Reprint

Download or read book Effects of Alfalfa Crop Sequence and Tillage Practice on Intake Rates of Pullman Silty Clay Loam and Grain Yields Classic Reprint written by Marvin Eli Jensen and published by Forgotten Books. This book was released on 2018-01-08 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Effects of Alfalfa, Crop Sequence, and Tillage Practice on Intake Rates of Pullman Silty Clay Loam and Grain Yields Pullman soil cracks extensively 2 to 4 days after surface irrigation (fig. Cracks in the surface crust increase in width and depth as drying continues. Similar cracks develop when a crop is grown. Cracks materially affect the intake during the first hour Of irrigation because they initially increase the surface area for intake. However, their effectiveness diminishes as the soil swells. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Effect of Alfalfa on the Subsequent Yields of Irrigated Field Crops Classic Reprint

Download or read book Effect of Alfalfa on the Subsequent Yields of Irrigated Field Crops Classic Reprint written by Carl S. Scofield and published by Forgotten Books. This book was released on 2017-11-19 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Effect of Alfalfa on the Subsequent Yields of Irrigated Field Crops At Scottsbluff, Nebr., Where the soil is light sandy loam, the effect of alfalfa has been to increase the. Yield of potatoes about 100 bushels per acre, to increase the proportion of marketable potatoes about 12 per cent, to increase the yield of oats about 6 bushels per acre, and to increase the yield of sugar beets tons per acre. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book The Effect of Fertilizers Including Several Minor Elements on the Growth of Alfalfa on Four Problem Sandy Soils

Download or read book The Effect of Fertilizers Including Several Minor Elements on the Growth of Alfalfa on Four Problem Sandy Soils written by Roy DeBolt Bronson and published by . This book was released on 1949 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effect of Soil Acidity and Lime Placement on Root Growth and Yield of Winter Wheat and Alfalfa

Download or read book The Effect of Soil Acidity and Lime Placement on Root Growth and Yield of Winter Wheat and Alfalfa written by Marvin Dean Kauffman and published by . This book was released on 1976 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of lime to an acid Nekia soil significantly increased the yield of winter wheat and alfalfa in a field experiment. Crop yields maximized when the lime was partially mixed into the surface four inches of the soil. Thorough mixing of the lime into the surface six inches of soil did not increase crop yields over partial mixing of lime, and on some plots the yields were reduced by the more thorough mixing treatment. The reduction in yield on the thoroughly mixed plots occurred with the lower rates of lime application. Deterioration of soil structure due to rototilling was also a factor in the reduction of yield in the plots where the lime was thoroughly mixed. The yields of wheat decreased over a three-year period following the application of one ton of lime per acre. It was felt that part of this decrease in yield was caused by a more thorough mixing of the lime into the soil with annual seedbed preparation on the partially mixed plots, and by a decrease of Ca and increase of Al in the soil solution as the quantity of free lime in the soil decreased. The importance of the soil solution pH and Al and Ca concentrations in the soil solution is also demonstrated by the fact that the R 2 values for the relationship between the soil test pH and wheat yields, were highest for the 1 N KC1 pH values the first two years, and highest for the water pH value the third year. Third-year wheat yields were also decreased by an infestation of the root fungus, Ophiobolus Graninus, with the adverse effect on the yield decreasing as the lime rates increased. High levels of soil acidity adversely affected the survival of the alfalfa seedlings and the rhizobia which inoculate the alfalfa. The concentration of nitrogen in the plants and the quantity of nitrogen harvested in the plants, increased as the rate of lime applied increased. The wheat and alfalfa roots which grew in the unlimed soil exhibited Al-toxicity symptoms. The Al-toxic roots were thicker than the healthy roots, and there was very little lateral root development on the Al-affected roots. The application of the intermediate and high rates of lime to the acid Nekia soil eliminated the Al-toxicity symptoms and promoted the growth of fine fibrous root systems. The distribution of the alfalfa roots in the samples taken from the field experiment, corresponded with the distribution of the lime in the soil. The field experimental data showed that the yields of wheat and alfalfa were closely correlated to the weight of the root samples. Growth chamber experiments using winter wheat as an indicator crop and acid Nekia and Dayton soils were also conducted. Maximum yields of dry matter were harvested when 30 per cent of the total soil volume was limed, and the dry matter yield decreased as the low rate of lime was mixed into larger volumes of soil. The wheat roots grew in the limed portion of soil, whereas root growth was restricted in the unlimed soil. Plant analysis data showed that the concentrations of plant nutrients were similar for all lime treatments. Plant water potential data indicated that water stress induced by Al-toxicity of wheat roots contributed to the lower yields of wheat grown in soil receiving zero and one ton of lime per acre.

Book Rotation Interval Soil Texture and Zone of Influence Studies on Alfalfa Autotoxicity

Download or read book Rotation Interval Soil Texture and Zone of Influence Studies on Alfalfa Autotoxicity written by John Alan Jennings and published by . This book was released on 1996 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autotoxicity of alfalfa (Medicago sativa L.) is a form of allelopathy in which established alfalfa plants produce a chemical(s) that inhibits establishment and yield of new alfalfa reseeded too soon following alfalfa. Effects of rotation intervals, soil texture, and the zone of influence of old alfalfa plants were evaluated to develop appropriate management strategies for reseeding old alfalfa stands. Experiments were conducted at three locations for rotation interval and zone of influence studies. For the rotation interval experiment, old alfalfa was killed with herbicides at different time intervals before a common spring planting date. Plant density of alfalfa at intervals of 12-mo, 6-mo, 0.75-mo, and 0.5-mo after killing old alfalfa with herbicides was 5.9, 2.2, 13.3, and 19.2% lower, respectively, than that for the control rotation interval of 18 mo. Dry matter yield was 0.5, 6.5, 2.9, and 7.8% lower, respectively, than the 18-mo control. Relative rankings of rotation intervals for both plant density and dry matter yield were consistent for 3 yrs after seeding. Granular chlorpyrifos insecticide treatment at planting did not significantly affect plant density or yield, but seed treatment with metalaxyl fungicide improved plant density by 5% over all five rotation intervals. Establishment and yield of new alfalfa within a 20-cm radius of an old alfalfa plant were reduced by 26% and 56%, respectively, compared to the control distance of 80-100 cm from an old plant, but yield of alfalfa seedlings between 40 and 80 cm away from the old plants was increased by 12% to 15% compared with the control. Autotoxic chemical(s) in water extracts from alfalfa herbage required 50% more water to move through 10-cm soil columns of Carlow silty clay loam than through Sarpy fine sandy loam. Results suggest that a 12-mo rotation interval is adequate for reseeding alfalfa with minimal autotoxicity; establishment and yield of new alfalfa would be inhibited at old plant densities as low as 8 plants m$\sp{-2}$ due to the autotoxic zone of influence; and alfalfa may be reseeded after shorter rotation intervals on sandy soils than on heavy textured soils due to differential leaching of the autotoxic chemical(s) by rainfall or irrigation.

Book Sustainable Agriculture Research and Education in the Field

Download or read book Sustainable Agriculture Research and Education in the Field written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest is growing in sustainable agriculture, which involves the use of productive and profitable farming practices that take advantage of natural biological processes to conserve resources, reduce inputs, protect the environment, and enhance public health. Continuing research is helping to demonstrate the ways that many factorsâ€"economics, biology, policy, and traditionâ€"interact in sustainable agriculture systems. This book contains the proceedings of a workshop on the findings of a broad range of research projects funded by the U.S. Department of Agriculture. The areas of study, such as integrated pest management, alternative cropping and tillage systems, and comparisons with more conventional approaches, are essential to developing and adopting profitable and sustainable farming systems.

Book Handbook of Plant Nutrition

Download or read book Handbook of Plant Nutrition written by Allen V. Barker and published by CRC Press. This book was released on 2016-04-19 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: The burgeoning demand on the world food supply, coupled with concern over the use of chemical fertilizers, has led to an accelerated interest in the practice of precision agriculture. This practice involves the careful control and monitoring of plant nutrition to maximize the rate of growth and yield of crops, as well as their nutritional value.

Book Agricultural Practices and Water Quality

Download or read book Agricultural Practices and Water Quality written by Ted L. Willrich and published by . This book was released on 1971 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: SEDIMENT AS A WATER POLLUTANT; PLANT NUTRIENTS AS WATER POLLUTANTS; PESTICIDES AS WATER POLLUTANTS; ANIMAL WASTES AS WATER POLLUTANTS; AGRICULTURAL POLLUTION IMPLICATIONS; AGRICULTURE'S INVOLVEMENT IN POLLUTED AND CLEAN WATER.

Book Agriculture in Semi Arid Environments

Download or read book Agriculture in Semi Arid Environments written by A.E. Hall and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: The semi-arid zones of the world are fragile ecosystems which are being sub stantially modified by the activities of mankind. Increasing human populations have resulted in greater demands on semi-arid zones for providing human susten ance and the possibility that this may enhance desertification is a grave concern. These zones are harsh habitats for humans. The famines that resulted from drought during the late 1960's and the 1970's in the African Sahel illustrated the unreliability of present agricultural systems in this zone. Large fluctuations in ag ricultural production have occurred in semi-arid zones of Australia, North Ameri ca, and the Soviet Union due to periodic droughts, even though considerable ag ricultural technology has been devoted to agricultural development in these zones. The challenge to mankind is to manage these different semi-arid zones so that pro ductivity is increased and stabilized, and environmental deterioration is decreased. Irrigation can be used to increase and stabilize agricultural production in semi-arid zones as discussed in Volume 5 of this series, Arid Zone Irrigation. The present volume, Agriculture in Semi-Arid Environments, focuses on dryland farming in semi-arid zones, and is relevant to the large areas of the world where rainfall is limiting and where water is not available for irrigation. This volume is designed to assist agricultural development in these areas and consists of reviews and analyses of available information by scientists working in Africa, Australia, and at the U ni versity of California.