Search

Your search keyword '"available Si"' showing total 2 results
Start Over Descriptor "available Si" Topic silicon
2 results on '"available Si"'

1. Silicon (Si) use efficiency in sandy soil amended by Si-loaded hydrogel.

Author

Rashad, Rama T.

Subjects
*SANDY soils, *WHEAT seeds, *SEED yield, *PLANT nutrition, *SILICON, *SPRAYING & dusting in agriculture, *QUARTZ
Abstract

Silicon (Si) plays an essential role in the mineral nutrition of plants. This creates a need to improve tools can provide plant-available Si (PAS) and increase its use efficiency (UE), especially under sandy soil conditions. This study was conducted to estimate Si use efficiency (Si-UE) in sandy soil treated by a hydrogel (water-absorbing polymer) loaded by Si. A field experiment was carried out using a hydrogel (H, 0.7 g kg−1 soil) that was mixed with quartz silica (S, 98.4% SiO2) to give HS homogenous mixtures with three mixing ratios 1:0.5 (HS1), 1:1 (HS2) and 1:1.5 (HS3). The HS mixture was sprayed by potassium humate solution (K-humate, 0.5 mL g−1 hydrogel) to obtain HS1K, HS2K, and HS3K treatments. All treatments were mixed with soil subsurface before wheat (Triticum aestivumL.) cultivation. Results showed that wheat yield and seed yield (t ha−1) increased significantly by applied treatments compared to the control C in the range 9.52–23.80% and 2.59–30.60%, respectively. The HS3 treatment significantly increased the total nitrogen N (mg kg−1) in seeds by 34.99%, phosphorus P by 17.46%, and potassium K by 4.84%. Available Si in soil (mg kg−1) increased in the order HS1 < HS2 < HS3, and with K-humate in the order HS1K < HS2K < HS3K. Total Si (g kg−1) in wheat seeds increased significantly in the order HS1 < HS2 < HS3, and HS1K < HS2K < HS3K with K-humate. Silicon use efficiency may decrease as the rate of applied Si increases. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

2. Thermal Preparation and Application of a Novel Silicon Fertilizer Using Talc and Calcium Carbonate as Starting Materials

Author

Xuehong Zhang, Zhonghua Wei, Kong Chhuon, Chen Gongning, Chao Wang, Chengfenghe Jin, Hua Lin, Jie Zhang, Yian Wang, and Junjian Zheng

Subjects
0106 biological sciences, Materials science, Silicon, Scanning electron microscope, CaCO3, Pharmaceutical Science, chemistry.chemical_element, 02 engineering and technology, engineering.material, Talc, 01 natural sciences, Article, Analytical Chemistry, law.invention, chemistry.chemical_compound, QD241-441, law, Drug Discovery, medicine, Calcination, calcination method, Physical and Theoretical Chemistry, Si fertilizer, talc, Organic Chemistry, Chemical process of decomposition, 021001 nanoscience & nanotechnology, Microstructure, Calcium carbonate, Chemical engineering, chemistry, Chemistry (miscellaneous), engineering, Molecular Medicine, Fertilizer, 0210 nano-technology, available Si, 010606 plant biology & botany, medicine.drug
Abstract

The deficiency of available silicon (Si) incurred by year-round agricultural and horticultural practices highlights the significance of Si fertilization for soil replenishment. This study focuses on a novel and economical route for the synthesis of Si fertilizer via the calcination method using talc and calcium carbonate (CaCO3) as starting materials. The molar ratio of talc to CaCO3 of 1:2.0, calcination temperature of 1150 °C and calcination time of 120 min were identified as the optimal conditions to maximize the available Si content of the prepared Si fertilizer. X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) characterizations elucidate the principles of the calcination temperature-dependent microstructure evolution of Si fertilizers, and the akermanite Ca2Mg(Si2O7) and merwinite Ca3Mg(SiO4)2 were identified as the primary silicates products. The results of release and solubility experiments suggest the content of available metallic element and slow-release property of the Si fertilizer obtained at the optimum preparation condition (Si-OPC). The surface morphology and properties of Si-OPC were illuminated by the results of scanning electron microscope (SEM), surface area and nitrogen adsorption analysis. The acceleration action of CaCO3 in the decomposition process of talc was demonstrated by the thermogravimetry-differential scanning calorimetry (TG-DSC) test. The pot experiment corroborates that 5 g kg−1 soil Si-OPC application sufficed to facilitate the pakchoi growth by providing nutrient elements. This evidence indicates the prepared Si fertilizer as a promising candidate for Si-deficient soil replenishment.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results