scholarly journals Effect of Different Monomers on Water Retention Properties of Slow Release Fertilizer Hydrogel

2016 ◽  
Vol 148 ◽  
pp. 201-207 ◽  
Author(s):  
Nurul Ekmi Rabat ◽  
Shahrir Hashim ◽  
Rohah Abdul Majid
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Slow Release Fertilizer ◽  
Water Retention Properties

Application of Slow-Release Fertilizer with the Function of Water-Absorption and Water-Retention in Position Engineering Camouflage

2011 ◽  
Vol 117-119 ◽  
pp. 1100-1102
Author(s):  
Shao Hong Li ◽  
Yue Guo Shen ◽  
Zhong Feng Shi
Keyword(s):  
Water Absorption ◽  
Water Retention ◽  
Slow Release ◽  
Rock Slopes ◽  
Slow Release Fertilizer ◽  
The Earth ◽  
Earth Slopes

The construction of position engineering causes a lot of naked earth slopes and rock slopes. Because the earth and rock lack of water absorption and water retention, traditional vegetation camouflage can not make it. The slow-release fertilizer with the function of water-absorption and water-retention make up it and which will be applied widely in vegetation camouflage of position engineering.

Preparation and Properties of the Slow-Release Fertilizer with Green Coat

2012 ◽  
Vol 518-523 ◽  
pp. 4745-4748
Author(s):  
Qing Wang ◽  
Sha Chen ◽  
Pei Guang Zhao ◽  
Yu Cao ◽  
Long Fei Zhu ◽  
...  
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Nutrient Release ◽  
Release Behavior ◽  
Digestion Method ◽  
Slow Release Fertilizer ◽  
Environmental Friendly ◽  
Influence Of Water ◽  
Slow Release Fertilizers ◽  
Kjeldahl Digestion

A kind of double-coated environmental friendly fertilizer was prepared by urea as a core, well-mixed keratin and oxidation starch as an inner coating, and superabsorbent polymer as the outer coating. The influence of water absorbency, water retention, and the slow-release behavior of the study fertilizer were investigated. 0.01M CaCl2 immersion extraction and Kjeldahl digestion method were used to measure the content of nitrogen. And the result showed that the nutrient release was 72wt% on the thirtieth day. This result corresponded with the standard of slow release fertilizers of the Committee of European Normalization (CEN) [1]. Keratin and oxidation starch were biodegradable polymer and nontoxic. Both the properties of the materials and the result of the slow-release behavior suggested a new kind of excellent, environmental friendly, slow-release fertilizer.

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 Effects of different fertilizer ratio on senescence of flag leaf in winter wheat

2020 ◽  
Vol 49 (1) ◽  
pp. 85-90
Author(s):  
Yafei Wang ◽  
Yan Shi
Keyword(s):  
Winter Wheat ◽  
Water Retention ◽  
Slow Release ◽  
Flag Leaf ◽  
High Yield ◽  
Flag Leaves ◽  
Slow Release Fertilizer ◽  
Compound Fertilizer ◽  
Mda Content ◽  
Use Efficiency

In order to increase the fertilizer use efficiency, the effects of different ratio of slow-release fertilizer, water retention agent and compound fertilizer in wheat production on senescence of flag leaf in winter wheat had been studied. The results showed that, water retaining agent 15 kg/ha with slow-release fertilizer 324 kg/ha and compound fertilizer 324 kg/ha (T2) effectively maintained the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) activity and soluble protein content in wheat flag leaves after flowering, and reduced the malondialdehyde (MDA) content which could delay the flag leaves senescence and gain high yield in wheat.

Pulping black liquor-based polymer hydrogel as water retention material and slow-release fertilizer

2021 ◽  
Vol 165 ◽  
pp. 113445
Author(s):  
Xueqian Liu ◽  
Yan Li ◽  
Yi Meng ◽  
Jie Lu ◽  
Yi Cheng ◽  
...  
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Black Liquor ◽  
Polymer Hydrogel ◽  
Slow Release Fertilizer

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.

Preparation and Properties of a Novel Semi-IPN Slow-Release Fertilizer with the Function of Water Retention

2017 ◽  
Vol 65 (50) ◽  
pp. 10851-10858 ◽  
Author(s):  
Yang Xiang ◽  
Xudong Ru ◽  
Jinguo Shi ◽  
Jiang Song ◽  
Haidong Zhao ◽  
...  
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Slow Release Fertilizer
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