A Study of an Autotoxic Reaction in Alfalfa (Medicago Sativa L.) Seed Germination Or Seedling Emergence PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Study of an Autotoxic Reaction in Alfalfa (Medicago Sativa L.) Seed Germination Or Seedling Emergence PDF full book. Access full book title A Study of an Autotoxic Reaction in Alfalfa (Medicago Sativa L.) Seed Germination Or Seedling Emergence by Mohammad Abdulaziz S. Abdulsalam. Download full books in PDF and EPUB format.
Author: Mohammad Abdulaziz S. Abdulsalam
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 212
Get Book Here
Book Description
Author: Mohammad Abdulaziz S. Abdulsalam
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 212
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 876
Get Book Here
Book Description
Author: Hwei-Yiing Li
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 86
Get Book Here
Book Description
Author: S.S. Narwal
Publisher: Springer Science & Business Media
ISBN: 9401141738
Category : Science
Languages : en
Pages : 259
Get Book Here
Book Description
The rapidly growing human population has increased the dependence on fossil fuel based agrochemicals such as fertilizers and pesticides to produce the required agricultural and forestry products. This has exerted a great pressure on the non renewable fossil fuel resources, which cannot last indefinitely. Besides, indiscriminate use ofpesticides for pests (weeds, insects, nematodes, pathogens) control has resulted in serious ecological and environmental problems viz. , (A) Increasing incidence of resistance in pest organisms to important pesticides. (B) Shift in pests population, particulary in weeds and insects. In weeds, species that are more closely related to the crops they infest have developed. In insects, scenario is most grim, the predators have been killed and minor insect pests have become major pests and require very heavy doses ofhighly toxic insecticides for their control. (C) Greater environmental pollution and health hazards (a) particularly from contamination of surface and underground drinking water resources and (b) from their inhalation during handling and application. (D) Toxic residues of pesticides pollute the environment and may prove hazardous to even our future generations. (E) Some agricultural commodities may contain minute quantities ofpesticides residues, with long tenn adverse effects on human and livestock health. Therefore, serious ecological questions about the reliance on pesticides for pests control has been raised. The use of fertilizers, besides causing environmental problems has also impoverished the soil health and decreased the beneficial soil fauna. For example, in some major crop rotations viz.
Author: Curtis Lee Jones
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 70
Get Book Here
Book Description
Author: John Alan Jennings
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 356
Get Book Here
Book Description
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.
Author: Marvin Henry Hall
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 222
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Plant physiology
Languages : en
Pages : 980
Get Book Here
Book Description
Author: Tafesse Kibatu Shikur
Publisher: LAP Lambert Academic Publishing
ISBN: 9783848423712
Category :
Languages : en
Pages : 100
Get Book Here
Book Description
Citrus seedlings are generally slower in growth when compared with other major fruits. It is clear that the more the seedlings stay in the nursery the more difficult it would be to fulfill required nursery activities such as protecting the seedlings from environmental hazards and diseases. In addition rapid growth rate will reduce the cost of nursery operations and enable fast virus indexing. Triacontanol, a common constituent of plant waxes, was shown to be an active growth substance, which at nanomolar concentrations increased the growth and yield of crops. However, these synthetic growth regulators are expensive and not available in developing countries. Growth stimulating effect of alfalfa has been documented by mulching or watering plant with an extract prepared by socking in water. Two experiments were conducted in two sites. The result of the study have revealed that seedling length, number of leaves, seedling diameter, dry weight and leaf area of Troyer Citrange can be increased by manipulating socking time and application intervals of alfalfa water extract and amount of alfalfa mulch.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 798
Get Book Here
Book Description
