نتایج جستجو برای: p olsen
تعداد نتایج: 1270437 فیلتر نتایج به سال:
Investigating the dynamics and distribution of soil phosphorus (P) fractions can provide a basis for enhancing P utilization by crops. Four treatments from 29-year long-term experiment in black with maize cropping were involved this study: no fertilizer (CK), inorganic nitrogen potassium (NK), nitrogen, phosphorus, (NPK), NPK plus manure (NPKM). We analyzed different layers using modified Hedle...
GOAL, SCOPE AND BACKGROUND Biosolids, i.e., treated sewage sludge, are commonly used as a fertilizer and amendment to improve soil productivity. Application of biosolids to meet the nitrogen (N) requirements of crops can lead to accumulation of phosphorus (P) in soils, which may result in P loss to water bodies. Since 1996, biosolids have been applied to a Pinus radiata D. Don plantation near N...
Citation: Fernández-Méndez M, Olsen LM, Kauko HM, Meyer A, Rösel A, Merkouriadi I, Mundy CJ, Ehn JK, Johansson AM, Wagner PM, Ervik Å, Sorrell BK, Duarte P, Wold A, Hop H and Assmy P (2018) Algal Hot Spots in a Changing Arctic Ocean: Sea-Ice Ridges and the Snow-Ice Interface. Front. Mar. Sci. 5:75. doi: 10.3389/fmars.2018.00075 Algal Hot Spots in a Changing Arctic Ocean: Sea-Ice Ridges and the ...
Background: Esketamine and ketamine have been shown to produce rapid antidepressant action in patients with treatmentresistant depression (TRD). The aim of the current study was to assess the efficacy, safety and dose response of intranasal esketamine in patients with TRD. Methods: This was a 2-Panel, doubly-randomized, double-blind, placebo-controlled, multicenter study. Panel A was conducted ...
Phosphate (P) rock is a finite natural resource, and its use for P fertilizer production has resulted in rapid depletion worldwide. In order to reduce the of resources, reducing input into agricultural systems necessary. The assessment legacy soil an option maintain crop yield with low input. Many models have been tested assess contribution uptake. However, these face common challenge as concep...
abstract the increasing of yield per unit area is usually achievable by improving the soil fertility level through using (chemical) fertilizers. the purpose of the present research was to evaluate the 6 extraction methods including olsen, morgan, ammonium bicarbonate-dtpa, colwel, bray and mehlich 3 in order to specify a suitable extractant(s) for estimating available phosphorus through using 2...
در این بررسی آثار کربنات کلسیم و ph بر سینتیک تثبیت فسفر در چهار خاک غیرآهکی تیمار شده با سطوح متفاوت کربنات کلسیم خالص، همچنین، در شش خاک تنظیم شده با ph 5 تا 9 مطالعه شد. خاک ها قبل از آزمایش با k2hpo4 به میزان mgp/kg45 تیمار شد. سپس، در اینکوبیتور به مدت صد روز در دمای c○25 نگهداری شد. در زمان های مشخص از خاک ها نمونه گیری و غلظت فسفر در آن ها به روش olsen اندازه گیری شد. نتایج نشان داد که و...
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