نتایج جستجو برای: the available soil p olsen
تعداد نتایج: 16296744 فیلتر نتایج به سال:
Phosphorus (P) constraint can be alleviated by increasing C inputs, which help to improve crop production and P fertilizer use efficiency. However, the effects of different manures on soil microbial biomass (MBP) fractions as well in calcareous soils remain poorly understood. Soil MBP pool involves mineralization immobilization processes, potentially changing availability. Therefore, (MBP, MBC)...
The application of manure (M) and straw (S) will increase the Olsen P phosphorus activation coefficient (PAC) in soil. Clarifying increasing trend PAC is crucial for rational fertilization. This study fitted equation between accumulated surplus, P, four treatments 28 years analyzed changes rates fractions. results showed linearly with NPK NPKS treatments; every 100 kg ha−1 increased by 5.9 6.7 ...
High concentrations of animal production in the United States have increased the concern about the environmental fate of phosphorus (P) in manures. We conducted a growth chamber study to develop phosphorus source coefficients (PSCs) for manures and fertilizers typically land applied and incorporated into calcareous soils of the western United States as well as to determine the potential plant P...
Abstract Background The soil P leaching change point (CP) has been widely used to evaluate risk. However, an automation calculation method for CP value, and effective risk grading performed classifying evaluation have not developed. Results This study optimized the process value with two different fitting models. Subsequently, based on Python programming language, a computation tool named Soil ...
Excessive application of phosphate fertilizer is common in vegetable fields and causes deterioration the rhizosphere environment, that is, soil oxygen (O 2 ) which further constrains root morphology construction limits yield. Nevertheless, interaction between response O environment to P utilization has rarely been reported. Therefore, we carried out an experiment applying different concentratio...
The bioavailability of phosphorus (P) in sediments from West Lake and Lake Tai (China) and Lough Erne (Northern Ireland) was evaluated using total P (TP), water soluble P (WSP), readily desorbable P (RDP), algal available P (AAP) and Olsen-P. The results indicated that the TP content, the amounts of phosphorus extracted by each method and their proportions to TP varied widely between sediments ...
with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...
Greenhouse eggplant monocropping in China has contributed to the aggravation of soil-borne diseases, reductions in crop quality and yield, and the degradation of physical and chemical soil properties. Crop rotation is one effective way of alleviating the problems of continuous cropping worldwide; however, few studies have reported changes in soil bacterial community structures and physical and ...
To evaluate the relationship of various P fractions and alkaline phosphatase activity with bean indices growing in 10 calcareous soils, amended with municipal sewage sludge from Chaharmahal-Va-Bakhtiari province, a greenhouse research was carried out. Soil samples were incubated for one month with sludge at a rate equivalent to 1% (w/w). Then, the P fractions, including P adsorbed by Fe and Al ...
According to importance of forests, enforcement of accurate and systematic management about them is necessary; in this regard recognition of soil quality is essential principles. With the aim of studying soil macroelement in each of Populus deltoiedes, Alnus subcordata, Taxodiom distichum stands and around uncultivated area (control), 8 samples taken from each of 0-15cm and 15-30cm depth. Soil ...
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