scholarly journals Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 262
Author(s):  
Semiu A. Kareem ◽  
Idayatu Dere ◽  
Daniel T. Gungula ◽  
Fartisincha Peingurta Andrew ◽  
Abdullahi M. Saddiq ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Sandy Soil ◽  
Water Retention ◽  
Slow Release ◽  
Tap Water ◽  
Methyl Cellulose ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Slow Release Fertilizer ◽  
Swelling Capacity

In this study, biodegradable slow-release fertilizer (SRF) hydrogels were synthesized from hydroxyl propyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), glycerol and urea (SRF1) and HPMC, PVA, glycerol, urea and blended paper (SRF2). The fertilizer hydrogels were characterized by SEM, XRD and FTIR. The swelling capacity of the hydrogels in both distilled and tap water as well as their water retention capacity in sandy soil were evaluated. The hydrogels had good swelling capacity with maximum swelling ratio of 17.2 g/g and 15.6 g/g for SRF1 and SRF2 in distilled, and 14.4 g/g and 15.2 g/g in tap water, respectively. The water retention capacity of the hydrogels in sandy soil exhibited higher water retention when compared with soil without the (SRFs). The soil with the hydrogels was found to have higher water retention than the soil without the hydrogels. The slow-release profile of the hydrogels was also evaluated. The result suggested that the prepared fertilizer hydrogels has a good controlled release capacity. The blended paper component in SRF2 was observed to aid effective release of urea, with about 87.01% release in soil at 44 days compared to the pure urea which was about 97% release within 4 days. The addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed Schott’s second order model. The release kinetics of urea in water was best described by Kormeye Peppas, suggesting urea release to be by diffusion via the pores and channels of the SRF, which can be controlled by changing the swelling of the SRF. However, the release mechanism in soil is best described by first order kinetic model, suggesting that the release rate in soil is depended on concentration and probably on diffusion rate via the pores and channels of the SRF.

Starch Based Soil Conditioner and Slow Release System

2014 ◽  
Vol 625 ◽  
pp. 877-880
Author(s):  
Zakaria Man ◽  
Ariyanti Sarwono ◽  
Mohammad Azmi Bustam ◽  
Khairun Azizi Azizli
Keyword(s):  
Sandy Soil ◽  
Water Retention ◽  
Slow Release ◽  
Modified Starch ◽  
Tapioca Starch ◽  
Soil Conditioner ◽  
Release System ◽  
Slow Release Fertilizer ◽  
Swelling Capacity ◽  
Slow Release System

Tapioca starch film modified with urea and borate was prepared and studied for possible application as soil conditioner and slow release fertilizer. To reduce the hydrophilicity and reinforce the film, lignin was added into the starch-urea-borate system. The presence of lignin reduces the swelling capacity. The lignin modified film remains intact and shows good reswelling capability in water. The water retention of soil was improved by addition of film in sandy soil. The release of entrapped urea in soil was also studied. This study shows that the lignin modified starch film can act as soil conditioner as well as slow release system.

scholarly journals Improving water retention capacity of an aeolian sandy soil with feldspathic sandstone

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lu Zhang ◽  
Jichang Han
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Sandy Soil ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Mu Us Sandy Land ◽  
Soil Water Characteristic Curves ◽  
High Suction ◽  
Feldspathic Sandstone

Abstract The Mu Us sandy land in China’s Shaanxi Province faces a critical water shortage, with its aeolian sandy soil endangering the regional eco-environment. Here we investigated the effects of feldspathic sandstone on water retention in an aeolian sandy soil from the Mu Us sandy land. Feldspathic sandstone and aeolian sandy soil samples were mixed at different mass ratios of 0:1 (control), 1:5 (T1), 1:2 (T2), and 1:1 (T3). Soil-water characteristic curves were determined over low- to medium-suction (1–1000 kPa) and high-suction (1000–140 000 kPa) ranges, by centrifuge and water vapor equilibrium methods, respectively. Results showed that the addition of feldspathic sandstone modified the loose structure of the aeolian sandy soil mainly consisting of sand grains. The van Genuchten model described well the soil-water characteristic curves of all four experimental soils (R2-values > 0.97). Soil water content by treatment was ranked as T2 > T3 > T1 > control at the same low matric suction (1–5 kPa), but this shifted to T2 > T1 > T3 > control at the same medium- to high-suction (5–140 000 kPa). T2 soil had the largest saturated water content, with a relatively high water supply capacity. This soil (T2) also had the largest field capacity, total available water content, and permanent wilting coefficient, which were respectively 17.82%, 11.64%, and 23.11% higher than those of the control (P-values < 0.05). In conclusion, adding the feldspathic sandstone in an appropriate proportion (e.g., 33%) can considerably improve the water retention capacity of aeolian sandy soil in the study area.

scholarly journals Synthesis and Characterization of Slow-Release Fertilizer Hydrogels Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper as Second Layer

2021 ◽  
Author(s):  
Fartisincha Peingurta Andrew ◽  
Daniel T Gungula ◽  
Semiu A Kareem ◽  
Abdullahi M Saddiq ◽  
Esther F Adebayo ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Slow Release ◽  
Tap Water ◽  
Release Kinetics ◽  
Methyl Cellulose ◽  
Release Behavior ◽  
Order Model ◽  
Swelling Kinetic ◽  
Slow Release Urea

In this study, a slow-release urea fertilizer hydrogel was synthesized from hydroxyl propyl methyl cellulose, polyvinyl alcohol and glycerol blends with paper (blended paper) as second layer. The fertilizer hydrogel was characterized by SEM, XRD and FTIR. Its retention in sandy soil, swelling behavior in distilled and tap water as well as slow-release behavior to urea were investigated. The results indicated that the fertilizer had good slow-release properties and ability to retain water in soil. However, the addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed the Schott&rsquo;s Second order model. The release kinetics of urea in water was best described by the Zero order model signifying that the release behavior was independent of fertilizer concentration

scholarly journals Bacterial polyextremotolerant bioemulsifiers from arid soils improve water retention capacity and humidity uptake in sandy soil

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Noura Raddadi ◽  
Lucia Giacomucci ◽  
Ramona Marasco ◽  
Daniele Daffonchio ◽  
Ameur Cherif ◽  
...  
Keyword(s):  
Sandy Soil ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Arid Soils ◽  
Retention Capacity

scholarly journals Salicylic Acid and Gibberelic Acid Ameliorates the Adverse Effects of Salinity on Chickpea

2015 ◽  
Vol 18 (1) ◽  
pp. 81-88 ◽  
Author(s):  
MI Hossain ◽  
MA Mannan ◽  
MA Karim
Keyword(s):  
Water Retention ◽  
Tap Water ◽  
Foliar Spray ◽  
Dry Weight ◽  
Water Retention Capacity ◽  
Flowering Stage ◽  
Retention Capacity ◽  
Relative Water ◽  
Gibberelic Acid ◽  
Total Dry Weight

A pot experiment was carried out under semi-controlled environmental condition in the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during December 2012 through March 2013 aiming to alleviate the salinity stress effects on chickpea using salicylic acid (SA) and gibberelic acid (GA3). Chickpea variety BARI Chola-5 was used in the experiment. Salt solution was prepared by adding tap water in sea water to make 5, 7.5 and 10 dS m-1 salinity level. Plants were irrigated with 5, 7.5 and 10 dSm-1 concentrations of saline water from 14th days after sowing (DAS) to maturity (100 DAS) and control plants were irrigated with tap water. Different concentration of SA (200 ppm and 400 ppm) and GA3 (10 ppm and 20 ppm) were applied as foliar spray once in a week from 20 DAS to flowering stage. The data for chlorophyll content in leaf and water relation traits such as relative water content (RWC) and water retention capacity (WRC) were measured 7 days after foliar spray of plant growth regulators at flowering stage. Total dry weight (root+shoot), yield and yield contributing characters were measured at maturity. Results indicated that salinity decreased total dry weight, chlorophyll content, relative water content, water retention capacity and yield of chickpea. Foliar application of SA and GA3 at different doses under different salinity conditions had the positive effects related to mitigation of salinity stress effect but low concentration i.e., SA and GA3 @ 200 ppm and 10 ppm, respectively were found to alleviate the adverse effects significantly on the above parameters at low salinity condition (5 dSm-1).Bangladesh Agron. J. 2015, 18(1): 81-88

scholarly journals Biopolymer Hydrogel Based on Acid Whey and Cellulose Derivatives for Enhancement Water Retention Capacity of Soil and Slow Release of Fertilizers

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3274
Author(s):  
Silvie Durpekova ◽  
Antonio Di Martino ◽  
Miroslava Dusankova ◽  
Petra Drohsler ◽  
Vladimir Sedlarik
Keyword(s):  
Water Retention ◽  
Nutrient Release ◽  
Ion Concentration ◽  
Water Retention Capacity ◽  
Cellulose Derivatives ◽  
Retention Capacity ◽  
Soil Conditioning ◽  
Swelling Capacity ◽  
Hydrogel Synthesis ◽  
Acid Whey

This study describes the development of a renewable and biodegradable biopolymer-based hydrogel for application in agriculture and horticulture as a soil conditioning agent and for release of a nutrient or fertilizer. The novel product is based on a combination of cellulose derivatives (carboxymethylcellulose and hydroxyethylcellulose) cross-linked with citric acid, as tested at various concentrations, with acid whey as a medium for hydrogel synthesis in order to utilize the almost unusable by-product of the dairy industry. The water uptake of the hydrogel was evaluated by swelling tests under variations in pH, temperature and ion concentration. Its swelling capacity, water retention and biodegradability were investigated in soil to simulate real-world conditions, the latter being monitored by the production of carbon dioxide during the biodegradation process by gas chromatography. Changes in the chemical structure and morphology of the hydrogels during biodegradation were assessed using Fourier transform infrared spectroscopy and scanning electron microscopy. The ability of the hydrogel to hold and release fertilizers was studied with urea and KNO3 as model substances. The results not only demonstrate the potential of the hydrogel to enhance the quality of soil, but also how acid whey can be employed in the development of a soil conditioning agent and nutrient release products.

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