Potassium carryover dynamics and optimal application policies in cotton production

Nitrogen and potassium in cover fertilization of cotton in latossols with different clay content

“…Sci., Bom Jesus, v.8, n.2, p.287-295, Abr/Jun. 2017 adequate use of soil chemical and physical analysis for the application of K fertilizers is important because it allows higher economic savings(Harper et al, 2012). The results of the present study are in accordance to literature and affirm the importance of taking into consideration the clay content in the expectation of cotton yield and for the greater efficiency of the use of nitrogen and potassium fertilizers in the crop.…”

“…In relation to macronutrients, the cotton crop is more demanding in potassium (K) and nitrogen (N), followed by calcium, magnesium, phosphorus and sulfur (Borin et al, 2015). Potassium is necessary for the growth and development of cotton plants, and has a substantial impact on increasing yield (Harper et al, 2012;Dong et al, 2010). The absorption of K by the cotton plant depends on several factors, among them, the genetic material, the K content in the soil, the Plant Production and Crop Protection Com.…”

Model for the decomposition of carnallite in aqueous solution

“…Potassium chloride is an important chemical fertilizer in agriculture (Harper et al, 2012;Chen et al, 2013;Cheng et al, 2013). A source of KCl is the carnallite double salt, which has the composition KCl·MgCl 2 ·6H 2 O or KMgCl 3 ·6H 2 O, and is either obtained as the ore or recovered from brine that favors carnallite formation (Dave and Ghosh, 2006).…”

Dynamic Optimization of Nitrogen in Plateau Cotton Yield Functions with Nitrogen Carryover Considerations

“…Of all the functional forms developed on theoretical and empirical grounds, polynomial functions are most commonly used (Frank, Beattie, and Embleton, 1990;Harper et al, 2012;Heady and Dillon, 1961;Hurley, Oishi, and Malzer, 2005;Roberts, English, and Larson, 2006;Xu et al, 2009). This functional form is assumed to be linear in parameters with no plateau growth and often overestimates maximum yield and optimal fertilizer recommendation (Ackello-Ogutu, Paris, and Williams, 1985;Lanzer and Paris, 1981).…”

“…Studies have shown that accumulation of carryover fertilizers significantly affects crop yield and net revenue in succeeding years (Harmon et al, 2016;Harper et al, 2012;Jomini et al, 1991;Raun et al, 1998;Segarra et al, 1989). However, the degree of nitrogen accumulation varies with the soil environment (e.g., rainfall) and soil health (e.g., available soil microbes, cation exchange, and organic matter).…”