cumulative and residual effects of organic fertilizer application on selected soil properties, water soluble p, olsen-p and p sorption index
نویسندگان
چکیده
long-term application of fertilizers containing p, especially organic fertilizers, usually increases the water soluble and available p of soil and at the same time may result in p accumulation in soil. organic fertilizers may also increase movement of p in the soil profile that could result in surface and ground water pollution. an experiment was conducted on field plots that received three applications (25, 50 and 100 mg ha-1) of solid dairy manure, sewage sludge, or urban solid waste compost, and one application of chemical fertilizers (250 kg ha-1 urea plus 250 kg ha-1 mono-ammonium phosphate) for 1, 2, 3, 4 or 5 consecutive years in order to investigate the residual and cumulative effects of organic and chemical fertilizers on selected soil properties, water soluble and bioavailable p as well as the p sorption index of the soil. average organic matter content in the soil increased as a result of organic fertilizer applications. the increase was proportional to the rate of application and was highest for dairy manure and lowest for urban solid compost. both the water extractable and bioavailable p contents of soil increased with the rate of application, the nature of organic fertilizer and the number (years) of applications, with the rate being the most effective and the nature of fertilizer the least effective. dairy manure had the largest and solid waste compost the smallest positive impact on both the water soluble and available p content of soil. effect of sewage sludge application on available p content of the soil was greater than its effect on the water extractable p. the phosphorus sorption index was independent of the source of p (organic or chemical), the nature and the rate of organic fertilizers and was only significantly dependent on the number (years) of fertilizer applications.
منابع مشابه
Cumulative and Residual Effects of Organic Fertilizer Application on Selected Soil Properties, Water Soluble P, Olsen-p and P Sorption Index
Long-term application of fertilizers containing P, especially organic fertilizers, usually increases the water soluble and available P of soil and at the same time may result in P accumulation in soil. Organic fertilizers may also increase movement of P in the soil profile that could result in surface and ground water pollution. An experiment was conducted on field plots that received three app...
متن کاملCumulative and Residual Effects of Organic and Chemical Fertilizers on Chemical Properties and P Sorption-Desorption Reactions in a Calcareous Soil: II. Phosphorus Desorption Kinetics
The kinetics of phosphorus (P) desorption in soils is important from plant nutrition and environmental perspectives. An experiment was conducted on the field plots that received 100 t ha of solid dairy manure 1 (DM), sewage sludge (SS), or urban solid waste compost (UC) and one rate of chemical fertilizer (CF) for 1, 3 or 5 consecutive years to investigate the residual and cumulative effects of...
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بسیاری از پدیده ها در جهان ما اساساً غیرخطی هستند، و توسط معادلات غیرخطی بیان شده اند. از آنجا که ظهور کامپیوترهای رقمی با عملکرد بالا، حل مسایل خطی را آسان تر می کند. با این حال، به طور کلی به دست آوردن جوابهای دقیق از مسایل غیرخطی دشوار است. روش عددی، به طور کلی محاسبه پیچیده مسایل غیرخطی را اداره می کند. با این حال، دادن نقاط به یک منحنی و به دست آوردن منحنی کامل که اغلب پرهزینه و ...
15 صفحه اولThe Interaction between P Fertilizer and Vermicompost on the Availability, Fractions of P and (Zea Mays L.) Growth Indices in a Calcareous Soil
In order to increase the available Phosphorous (P), chemical fertilizers are applied; however, P chemical fertilizers are transformed into low available forms over time. Organic amendments could be effective in improving the efficiency of P fertilizers. The aim of this study was to investigate the effect of P fertilizers and vermicopost on the availability and fractions of P and maize (Zea Mays...
متن کاملEffect of Fertilizer and Soil Compactness Interaction on N, P and K in the Culture of Lawn
Under favorable soil conditions such as existence of easily destructible organic compounds, balanced heat and moisture, adequate ventilation and abundant nutrients, organic materials are mineralized. Once mineralizing occurs, mineral elements like P, S, Ca, Mg, K and other cations are released. A related study was conducted to determine the effect of seven organic fertilizers (Leaf Mold (LM), R...
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عنوان ژورنال:
journal of agricultural science and technologyناشر: tarbiat modares university
ISSN 1680-7073
دوره 11
شماره Number 4 2010
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