Controlled-Release and Slow-Release Fertilizers as Nutrient Management Tools

Abstract

There are many fertilizer sources available for commercial crop production. The characteristics of each fertilizer type determine whether its use poses an advantage or a disadvantage to a farmer. This 7-page fact sheet focuses on how to select the right fertilizer to enhance profitability and satisfy best management practices (BMPs). Written by Guodong Liu, Lincoln Zotarelli, Yuncong Li, David Dinkins, Qingren Wang, and Monica Ozores-Hampton, and published by the UF Department of Horticultural Sciences, October 2014. (UF/IFAS Photo by Thomas Wright)
 HS1255/HS1255: Controlled-Release and Slow-Release Fertilizers as Nutrient Management Tools (ufl.edu)

Modifying soluble NPK release with hydrophobized nanocellulose-based hydrogels for sustainable enhanced efficiency fertilizers

“…2,4 These losses provoke eutrophication in lakes and other estuarine ecosystems, while volatilization of nutrients leads to accumulation of greenhouse gases such as ammonia and nitrous oxide. 5,6 Collectively, improper and inefficient fertilization strategies affect both environmental quality and quality of life. These pressures necessitate the development of more ecofriendly and efficient fertilizers.…”

“…These pressures necessitate the development of more ecofriendly and efficient fertilizers. 5,7 To mitigate fertilizer-induced pollution, new systems have been developed which control the release of nutrients. 8 Such systems are commonly called enhanced efficiency fertilizers, or EEFs.…”

The Application of Slow Release NPK Fertilizer on Inceptisols to Changes of Soil Chemical Properties and Growth of Sweet Corn (Zea mays L. saccharata).

“…The results of Trenkel's research [4] show that the application of slow release fertilizer has the potential to reduce the use of fertilizer doses by 20-30% recommended from conventional fertilizers while getting the same results. The advantage of using slow-release fertilizers is to maintain the concentration of available nutrients in the soil, reduce runoff and loss of nutrients in the soil due to leaching due to the slow rate of nutrient release [5].…”

Uso de fertilizante de liberação controlada no cultivo de tomate em ambiente protegido

“…Esse revestimento ou encapsulamento dos FLC é utilizado para controlar a penetração de água, a taxa de dissolução do fertilizante e a duração do tempo de liberação dos nutrientes (LIU et al, 2014). Esse controle é possível pela manipulação de algumas variáveis controladas durante o processo de fabricação, tais como: natureza e espessura do material de revestimento, por exemplo (TRENKEL, 2013).…”

“…A distribuição em porcentagens, condiz com o conceito de fertilizante de liberação controlada, que apresenta mecanismos de liberação capazes de prolongar a disponibilidade de nutrientes no tempo, ajustando-se a demanda da planta através de uma barreira física, que consiste num recobrimento ou encapsulamento" (TRENKEL, 2010). Tal revestimento é quem controla a penetração de água, a taxa de dissolução do fertilizante e a duração do tempo de liberação dos nutrientes (LIU et al, 2014). O material utilizado no FLC, no experimento, é o poliuretano, sendo considerados um dos materiais de maior resistência, conferindo-lhe maior precisão de controle (TRENKEL, 2010).…”