Author: Harold Francis RhoadesPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 36
Book Description
Effect of Organic Matter Decomposition on the Solubility and Fixation of Phosphorus in Alkaline Soils
Author: Harold Francis RhoadesPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 36
Book Description
Phosphate Fixation in Soils
Author: Jesse Lowell DoughtyPublisher:
ISBN:
Category : Soils
Languages : en
Pages : 152
Book Description
Experiment Station Record
Author: United States. Office of Experiment StationsPublisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 2162
Book Description
Experiment Station Record
Author: U.S. Office of Experiment StationsPublisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1068
Book Description
The Role of Organic Matter in Modern Agriculture
Author: Y. ChenPublisher: Springer Science & Business Media
ISBN: 9400944268
Category : Technology & Engineering
Languages : en
Pages : 312
Book Description
The use of organic residues as a means of maintaining and increasing soil fertility is of long-standing. This tradition has been somewhat neglected since the introduc tion of mineral fertilizers at low cost. More and more farmers and scientists are now showing renewed interest in the proper and effective use of org~tnic residues, composts and other recycled organic additives. The role and function of organic amendments in modern agricultural systems have become topics of major interest in the scientific and agricultural communities. Research work on residue disposal has provided new concepts on the interaction between organic components and soils as well as new handling technologies (e. g. pelletizing of organic residues). The trend to conserve energy has led scientists to study the minimal tillage system, to find ways of replacing conventional inorganic fertilizers with natural organic prod ucts or microbial preparations, and to develop new composting methods. The drive to achieve higher yields in commercial greenhouse farming has led to a search for optimum substrates as growth media and for improved management techniques. This has led to the introduction of organic substitutes for peat, nota bly those originating from agricultural wastes. Another important aspect is the current interest in organic farming, where use of synthetic chemicals is avoided or prohibited. An increasing percentage of the population in highly developed countries is willing to pay premium prices for food produced on soils where inorganic fertilizers and other agricultural chemicals have not been used.
Effect of Heat and Oxidation on the Phosphorus of the Soil
Author: Peter Powell PetersonPublisher:
ISBN:
Category : Soils
Languages : en
Pages : 28
Book Description
Soil Organic Matter Decomposition
Author: Fadly Hairannoor YusranPublisher:
ISBN:
Category : Humus
Languages : en
Pages : 524
Book Description
[Truncated abstract] Relationships between the persistence of organic matter added to soil, the dynamics of soil organic carbon (C) and phosphorus (P) were examined in four experiments on lateritic soils of Western Australia. The main objective was to quantify the release of P following organic matter application in soils which have high P adsorbing capacity. Another objective was to confirm that due to its recalcitrant materials, the effect of peat lasted longer in soil than other sources of organic matter in terms of increasing plant-available P fractions. Three experiments were conducted under glasshouse conditions for various lengths of time, with nine- to twelve-month incubations to investigate these hypotheses. As expected, organic matter with lower C:N ratios than peat (lucerne hay) decomposed more rapidly compared with peat, and the most active mineralisation took place within the first three months of incubation. Soil organic-C (extracted by 0.5 M K2SO4) had a significant positive correlation with P extracted with 0.5 M NaHCO pH 8.53. For a higher application rate (120 ton ha-1), peat was better than wheat straw and lucerne hay in increasing extractable bicarbonate-P concentrations in soil, especially at incubation times up to 12 months. Throughout the experiment, peat was associated with a steady increase in all parameters measured. In contrast to peat, nutrient release from lucerne hay and wheat straw was rapid and diminished over time. There was a tendency for organic-C (either in the form of total extractable organic-C or microbial biomass-C) to steadily increase in soil with added peat throughout the experiment. Unlike wheat straw and lucerne hay, extractable organic-C from peat remained in soil and there was less C loss in the form of respiration. Therefore, peat persisted and sequestered C to the soil system for a longer time than the other source of organic matter. Freshly added organic matter was expected to have a greater influence on P transformation from adsorbed forms in lateritic soils than existing soil organic matter. By removing the existing soil organic matter, the effect of freshly applied organic matter can be determine separately from that of the existing soil organic matter for a similar organic-C content. In order to do this, some soil samples were combusted up to 450° C to eliminate inherent soil organic matter. The release of P was greater when organic-C from fresh organic matter was applied to combusted soils than in uncombusted soils that contained the existing soil organic matter. The exception only applied for parameters related to soil micro-organisms such as biomass-C and phosphatase. For such parameters, new soil organic matter did not create conditions favourable for organisms to increase in activity despite the abundance of organic matter available. More non-extractable-P was formed in combusted soils compared to bicarbonate-P and it contributed to more than 50% of total-P. As for the first experiment, peat also showed a constant effect in increasing bicarbonate extractable-P in the soil.
Cycles of Soils
Author: F. J. StevensonPublisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 408
Book Description
The carbon cycle. Carbon balance of the soil and role of organic matter in soil fertility. Environmental aspects of the soil carbon cycle. The nitrogen cycle in soil: global and ecological aspects. The international cycle of nitrogen in soil. Impact of nitrogen on health and the environment. The phosporus cycle. The sulfur cycle. The micronutrient cycle.
Effect of Soil Applications of Insecticides on the Growth and Yield of Vegetable Crops
Author: M. W. StonePublisher:
ISBN:
Category : Insecticides
Languages : en
Pages : 778
Book Description
Author: