Nitrate Leaching and Nitrogen Recovery Following Application of Polyolefin-Coated Urea to Potato

Nitrogen Release Dynamic of Different Coated Urea under Puddle Lowland Rice Cultivation

“…These finding are in close conformity with those of Gandeza et al, (1991) and Zvomuya et al, (2003). Dissolution of nutrient in coating depends on coating thickness, size of urea particles and permeability of water into the coating (Shaviv et al, 2003).…”

Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

“…Contudo, devem ser evitadas doses excessivas, principalmente as aplicadas tardiamente, que induzem a planta a produzir folhas em demasia e a alongar seu crescimento e maturação, o que implica redução do período desejável de tuberização e, consequentemente, menor armazenagem de amido nos tubérculos, resultando em menor produtividade e qualidade do tubérculo (Zvomuya et al, 2003).…”

Nutrient Mobility and Availability with Selected Irrigation and Drainage Systems for Vegetable Crops on Sandy Soils

“…Seepage-irrigated Irish potato produced on Elley fine sand (90-95% sand), USA had a significantly higher NUE for N with CRFs treatment compared with soluble fertilizer treatment only when 112 kg N ha -1 was www.intechopen.com applied, but not when 168 and 224 kg N ha -1 were applied (Hutchinson et al, 2003). Other studies showed similar results of higher NUE for N with CRFs compared with soluble fertilizers only with lower N application rate applied, but not with higher rate (140 vs. 280 kg N ha -1 ; Zvomuya et al, 2003;and 146 vs. 225 kg N ha -1 ;Pack et al, 2006; both for potato production on sandy soils). Nutrient availability caused by the use of CRFs and SRFs over the soluble fertilizer can be improved by the interaction and competition between plant roots, soil microorganisms, chemical reactions, and pathways for loss, and matching nutrient release with plant demand (Shaviv & Mikkelsen, 1993).…”