Citric Acid (CA)–Modified Biochar Improved Available Phosphorus Concentration and Its Half-Life in a P-Fertilized Calcareous Sandy Soil

Author(s):  
Adil Mihoub ◽  
Abu El-Eyuoon Abu Zied Amin ◽  
Hamid Reza Motaghian ◽  
Muhammad Farhan Saeed ◽  
Asif Naeem
Agriculture ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 553
Author(s):  
Inga-Mareike Bach ◽  
Lisa Essich ◽  
Torsten Müller

Despite phosphorus resources on Earth being limited, over fertilization in many agricultural situations causes significant resource consumption. Phosphorus-recycling within agricultural production can reduce global dilution into the environment and is thus essential to secure sustainable future supply. This study investigated the fertilization efficacy of phosphorus fertilizers recycled from biogas digestates in maize shoots grown under controlled greenhouse conditions, in two soils, in a pot experiment. Variables investigated were plant-available phosphorus in soil, plant biomass production, and concentration of phosphorus, calcium, and magnesium in shoots. Soils were treated with three different fertilizer fractions, separated from biogas digestates, at equivalent phosphorus concentrations, using different combinations and application techniques, isolated or in combination, and compared to triple superphosphate (TSP) as a reference. One of the fractions (P-Salt) had effects on biomass production and plant phosphorus concentration equivalent to TSP in agricultural surface soil. In the second soil (with less active soil life and nutrient content), equivalence to TSP was achieved with combinations of two recycled fractions (P-Salt and dried solids). The enhancement of the phosphorus fertilizing effect by the solids was synergistic, indicating that the solids had a soil conditioning effect. The results show that biogas digestates are a valuable source for phosphorus recycling of fractions that have equivalent or even superior fertilizing properties compared to TSP.


2020 ◽  
Vol 15 (3) ◽  
pp. 624-631
Author(s):  
Vijaya Kumar Kallushettihalli Mallappa ◽  
Vijaya Kumara

The present study was carried out to determine the periodic variation in physico-chemical characteristics of mangrove soil samples. The soil samples had been accrued from four distinctive places of Kundapura mangrove areas in three seasons, monsoon, pre-monsoon and post-monsoon. Soil analysis pertaining to various variables such as total Nitrogen, Phosphorus, Potassium, pH and Electrical conductivity. Soil pH is assorted from 3.84 to 6.66. Electrical conductivity is assorted from 0.02 dSm-1 to 9.60 dSm-1. Available nitrogen is assorted from 30.7 kg/ha to 323 kg/ha. Available phosphorus concentration has ranged between 1.37 kg/ha and 47.27 kg/ha. Available potassium is differed from 117.43 kg/ha to 537.63 kg/ha. The results confirmed variations in all of the analyzed parameters of the soils amassed from four stations.


2005 ◽  
Vol 85 (5) ◽  
pp. 589-597 ◽  
Author(s):  
Chi Chang, Joann K. Whalen ◽  
Xiying Hao

Migration of P from soils to water resources poses a risk of surface water eutrophication, and increase in P concentration in soils through manure or fertilizer addition would exace rbate this problem. Investigating the rate of increase in P concentration of surface soil receiving livestock manure is crucial to the development of best manure management strategies and prevention of eutrophication of aquatic systems. In this study, the changes in P concentrations of surface soils (0- to 15-cm depth) receiving 25 annual manure applications at rates of 0, 30, 60 and 90 Mg ha-1 yr-1 under non-irrigated conditions and at rates of 0, 60, 120 and 180 Mg ha-1 yr-1 under irrigated conditions were examined. The soil test P (STP) and total P (TP) of the surface soil increased with the TP through manure application over a 25-yr period. The STP pool was about 38% of the soil TP pool, similar to ratios of STP to TP in feedlot cattle manure. While the high proportion of STP to TP could be beneficial for crop production, it could also increase the potential for P losses from these soils through runoff and leaching. The changes in TP and STP concentrations of the surface soil were modelled with an expone ntial rise to maximum function: TP = 0.69 + 5.06 (1 − e(−0.087x)) and STP = 0.029 + 2.21 (1 − e(−0.082x)) where x is the cumulative TP applied. Although the model was developed for a specific soil and type of manure, it could be adapted to other soils or manure sources by adjusting the model coefficients for the particular soil and/or manure type. These adjustments would not require as extensive a data set as was required to develop the original model. This model could be used to determine the amount of TP that could be applied for a given critical STP. Producers, regulatory agencies, planners, and extension specialists could also use this model to make decisions on manure P management. Key words: Long-term cattle manure application, total phosphorus, available phosphorus, rate of accumulation, non-irrigated and irrigated cropping


Food Safety ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 90-94
Author(s):  
Yoshichika Hirahara ◽  
Kazuyoshi Iwata ◽  
Katsuhiko Nakamuro
Keyword(s):  

2019 ◽  
Vol 17 (1) ◽  
pp. 893-901 ◽  
Author(s):  
Małgorzata Wyciszkiewicz ◽  
Marcin Sojka ◽  
Agnieszka Saeid

AbstractThis paper discusses the effect of the utilization of Bacillus megaterium in the microbial solubilization process where poultry bones or ash were used as a source of renewable phosphorus. The process was performed in a large scale laboratory. The pH of the solution decreased during one-week solubilization, which had a direct influence on the increased concentration of phosphorus determined in the solution. It was proved that the phosphorus concentration in the solution was significantly correlated with the biomass concentration and pH. The trial allowed verification of the suitability of the method to prepare two P fertilizers: one based on poultry bones and one on ashes. The elemental analysis of their composition suggests that the bones are a P-bearing resource with properties better than ash. That enables for more efficient scaling-up the solubilization although the concentration of total phosphorus was comparable in both cases. The total amount (100%) of phosphorus was present in a form available to plants in the formulation based on the poultry bones, while 64% of plant available phosphorus was present in the formulation based on the ash. The concentration of Cd was significantly lower in the case of fertilizer based on bones with respect to ash.


2012 ◽  
Vol 461 ◽  
pp. 466-469
Author(s):  
Deng Ling Jiang ◽  
Yu Min Zhang ◽  
Ning Zheng

Phosphorus limitation on bacterial regrowth was studied in source water, water treatment process and water distribution system of J Water Supply Plant in T city, by modified AOC method and MAP analysis. Based on the study, the follows can be concluded: ① MAP(Microbially Available Phosphorus) concentration was higher in source water and water treatment process, which was 5~38µg PO43--P/L. However in water distribution, MAP concentration was lower, which was less than 5µg PO43--P/L. ②Coagulation and sedimentation can remove MAP efficiently. 31%~68% of MAP can be removed in these process. ③ In source water and water treatment process, there was no evident difference between AOCpotential, AOCp and AOCnative. So assimilable organic carbon (AOC) was the most important factor of bacterial regrowth. In water distribution system, the concentration of AOCpotential and AOCp were 2~8.7 times of the concentration of AOCnative. So phosphorus limited bacterial regrowth.


2000 ◽  
Vol 19 (4) ◽  
pp. 275-282 ◽  
Author(s):  
Raman Bassi ◽  
Shiv O. Prasher ◽  
B.K. Simpson

Author(s):  
Khadraji Ahmed ◽  
Bouhadi Mohamed ◽  
Ghoulam Cherk

Background: Growing chickpea (Cicer arietinum) plants is affected by several environmental constraints as osmotic stress and nutrients deficiency particularly phosphorus (P). For other legume species, it was confirmed that P deficiency affects negatively their rhizobial symbiosis. The purpose of this study was to assess the effect of soil available P level on chickpea-rhizobia symbiosis under field conditions at Oualidia region of Morocco. Methods: Ten farmers’ fields with different soil available P levels were considered to carry out this study based on samples of 10 plants per plot. Result: The results showed that the plants from soil 7, with the lowest pH and the highest available P level (23.52ppm), presented high shoot dry weight (38.3 g/plant). Meanwhile the soil 5 with the lowest available P content showed low plant growth. The shoot P content was positively linked to soil P level but nodule biomass showed an irregular variation with soil available P level. Furthermore, it was confirmed that adequate plant P nutrition results in high chickpea yield and it was the case for plants from soil 7 presenting a mean yield of 62 seeds per plant). Finally, strong correlation was noted between yield and phosphorus concentration in soil (r=0.94).


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