Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder

Abstract

The use of controlled release fertilizer (CRF) has become a new trend to minimize environmental pollution. In this study, urea-kaolinite containing 20 wt% urea after one hour dry grinding was mixed with different concentrations of chitosan as a binder to prepare nitrogen-based CRF. Fourier transform infrared spectroscopy confirmed the hydrogen bonding between urea and kaolinite. Covalent interaction between urea-kaolinite and chitosan make the granules stronger. The nitrogen release was measured in 5 days interval using a diacetylmonoxime calorimetric method at a wavelength of 527 nm. The results illustrated that by increasing the chitosan concentration from 3 to 7.5%, nitrogen release decreased from 41.23 to 25.25% after one day and from 77.31 to 59.27% after 30 days incubation in water. Compressive stress at break tests confirmed that granules with chitosan 6% had the highest resistance and were chosen for ammonia volatilization tests. Ammonia volatilization was carried out using the forced-draft technique for a period of 10 weeks. The results showed that the total amount of ammonia loss for conventional urea fertilizer and urea-kaolinite-chitosan granules was 68.63 and 56.75%, respectively. This controlled release product could be applied in agricultural crop production purpose due to its controlled solubility in the soil, high nutrient use efficiency and potential economic benefits.

Slow-Release Urea Prills Developed Using Organic and Inorganic Blends in Fluidized Bed Coater and Their Effect on Spinach Productivity

“…In addition. The band which appeared at 1465 cm −1 is attributed to-CN stretching [33][34][35][36]. At 1154 cm 1 , a stretching vibration mode resultant from the-C-O-C group can be seen.…”

“…[ [33][34][35][36].At 1154 cm 1 , a stretching vibration mode resultant from the-C-O-C group can be seen. C-H overtone stretching vibrations are observed at 1154 cm −1 .…”

Dynamics of chitosan based NPK-nanofertilizers in greenhouse cucumber production system

“…However, it was followed by 30% RDF as nano-fertilizer for phosphorous (51.7%) and potassium (83.3%). Chitosan nano-layers act as barrier against water penetration during fertilizer release making it slow and steady, thus able to adjust the speed of nutrient release, thereby improving efficiency (Ghahremani et al, 2014;Roshanravan et al, 2015). Hagab et al (2018) reported that increase in phosphorous use efficiency is due to better absorption and utilization of phosphorous in the form of nanofertilizer as P is slowly released during entire growth period.…”

Formulasi dan Pola Kelarutan N Pupuk Urea-Zeolit Lepas Lambat

“…Kusumastuti et al 2019 menyatakan bahwa multilayer kitosan-polianion seperti kitosan-alginat (CA) 5, kitosanpektin (CP) 5, dan kitosan-TPP (CT) 5 mampu membentuk lapisan sebagai pelapis granul pupuk yang dapat meningkatkan kekuatan mekanik dan mengurangi pelepasan nitrogen pupuk. Peningkatan konsentrasi Kitosan mengakibatkan penurunan pelepasan nitrogen setelah satu hari atau setelah 30 hari diinkubasi dalam air (Roshanravan et al 2015).…”