5 results

Boron Leaching Decreases withIncreases on Soil pH

Alessandra Aparecida de Sá, Paulo Roberto Ernani

06/Apr/2016

ABSTRACT Management of boron fertilization depends on the magnitude of B leaching in the soil profile, which varies proportionally with the concentration of B in the soil solution, which, in turn, decreases as the soil pH increases due to the higher sorption of B on soil solid surfaces. The objective of this study was to quantify the effect of liming and rates of B applied to the soil on B leaching. The experiment was carried out in the laboratory in […]

Addition of triple superphosphate anticipates nitrogen leaching in soil

Analu Mantovani, Paulo Roberto Ernani, Luis Sangoi

01/Oct/2007

Leaching of N added to soils as ammonium or as other forms that transform into it depends partially on nitrification because ammonium is retained by the soil negative charges, while nitrate remains completely in the soil solution. Since the decrease of the soil pH at fertilized sites can negatively affect nitrification, our study aimed to evaluate the effect of adding an acidifying phosphate together with nitrogen fertilizers on nitrogen leaching in an acid soil. The experiment was carried out in […]

Vertical mobility of cations as influenced by the method of potassium chloride application to variable charge soils

Paulo Roberto Ernani, Cimélio Bayer, Jaime Antônio de Almeida, Paulo Cézar Cassol

01/Apr/2007

The magnitude of the vertical movement of nutrients in the soil profile determines their contact with plant roots and leaching, thus affecting the timing and method of fertilizer application. This study aimed to assess the K mobility in the soil as influenced by rate and method of potassium chloride addition. The experiment was carried out in 1998, using 7.5 cm wide and 35 cm long PVC leaching columns. Potassium was applied at rates of 0, 150 and 300 mg kg-1 […]

Oat straw (Avena strigosa) nutrient mineralization with different silicon composition

L. S. Silva, H. Bohnen

01/Jun/2001

Most of the silicon absorbeb by plants remains deposited on the external part of the cell walls as a layer of amorphous silica (SiO2.nH2O), probably affecting straw mineralization in soils. An experiment was performed with the aerial part of oat plants, cultivated in nutrient solution with and without silicon addition, to evaluate this hypothesis. Dried aerial parts of oat plants tissue was mixed with soil or washed quartz sand and placed in PVC tubes. Distilled water was percolated through the […]

Corn straw mineralization and carbon, calcium, magnesium and potassium adsorption in mixtures with kaolinite and synthetic goethite

L. S. Silva, H. Bohnen

01/Jun/2001

Carbon and nutrients released from the mineralization of organic materials can interact with mineral components changing their dynamics in the soil. In this study, mixtures of corn straw, kaolinite, synthetic goethite, and quartz sand were leached with water after 7, 15, 33, 68 and 113 days of incubation at room temperature. Concentrations of soluble carbon, calcium, magnesium, and potassium were measured and accumulated over time. After 200 days, the total carbon remaining in the mixture was quantified. Total calcium, magnesium, and potassium […]