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managing a perched water table on a slowly permeable agrillic or spodic soil layer ( Pitts et al., 2002 ). In seepage-irrigated fresh-market tomato ( Solanum lycopersicum L.) production using soluble fertilizer sources, all the phosphorus and

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Abstract

Fertilizers were mixed in Morrison sandy loam at 250 and 500 mg N/500 g soil. Columns were kept under uniform environmental conditions and eluted at 3, 5, 7, 14, 21, 28, 35, 49, 63, 77, 91 and 121 days to evaluate their N-release characteristics. During the first week, N leached ranged from a low of 2% for sulfur-coated urea to a high of 12% for Mag AmP. Nitrogen released during the 17-week period in descending order was Precise (12N-2.6P-5.0K and 8-4.8-4.1), Osmocote (14-6.1-11.6 and 18-2.6-9.8), Mag Amp (fine, 7-17.5-5), SCU (36-0-0, 26% N 1st week), Osmocote (18-2.2-9.1), SCU (36-0-0, 10% N 1st week), Mag AmP (Coarse, 7-17.5-5), Nitroform (38-0-0), IBDU (31-0-0), Uramite (39-0-0), Agriform (14-1.7-5), and Agriform (20-4.4-4.1). The recovery of leached total N ranged from 77% for short to 13.5% for long-duration fertilizers for the 17 weeks.

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remediate SWR, additional proof-of-concept laboratory studies were conducted with the following objectives: 1) to evaluate the effectiveness of 10 diverse enzymes directly applied on two SWR soils at three dosages using a 3-d incubation to remediate SWR; and

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soapstock, and canola meal. Treatments were replicated three times, randomized, and maintained in darkness at 22 °C. Incubation was initiated by adding tap water to soil in each cup to achieve 60% of water-holding capacity by weight. This was calculated as

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Authors: , , and

filtration system. C:N ratio varied from 1.6 to 6.0. Total P and K ranged from 5.7 to 12.4 and 8.5 to 18.7 g·kg −1 , respectively. Net N mineralization over the incubation period was generally similar between the two unamended soils ( Fig. 1 ). An average of

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a field rate of 2.2 kg·ha −1 a.i. for the HA and 16 and 24 kg·ha −1 N and P, respectively. After application, an additional 250 g of dry soil was added to each pot. Table 2. Characteristics of the soils used in the greenhouse and incubation

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, incubation assays remain the preferred way of estimating mineralizable N from soil ( Carter and Gregorich, 2008 ; Gianello and Bremner, 1986 ). Among the incubation methods, the Stanford and Smith (1972) aerobic incubation method is regarded as the

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addition to in situ measurements, laboratory incubation methods have been employed to effectively estimate the N mineralization potential of soils amended with cover crop residues ( Johnson et al., 2012 ; Masunga et al., 2016 ). To our knowledge, the

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contents of water- and ethanol-extracted plant extracts and urease activity (UA) and nitrification potential (NP) in the plant extract-treated soil under 5-h incubation. The data were shown as means of triplicated measurements with sd . The plant extracts

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any weeds that germinated in the jars were removed regularly. After incubation, the TCA content of all soils were evaluated by solid-phase microextraction (SPME)/GC-MS, as described later. The four soil challenge trials were divided into two sets of

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