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Balanced Fertilizer Use through soil testing Leads to Higher Yields and Nutrient Contents of Maize Grains

Agricultural Sciences 2022年第10期13卷 1103-1116页

作者： Adel Badr El-Nasharty Mohamed Mostafa El-Fouly Mohamad Farouk El-Dahshouri Fertilization Technology Department National Research Centre Giza Egypt

Fertilizers use can be optimized through soil testing and leaf analysis. This paper deals with using soil analysis as a base for fertilizer use in maize. A field experiment was carried out in two summer seasons of 2013 and 2014 with maize (triple hybrid) in Oraby Village, Mariut sector, Alexandria, Egypt. soil testing shows that soil was clay loam, with high Na and CaCO3 contents with high pH, low organic matter, medium P and K and low micronutrient contents (Fe, Zn, Mn and Cu), seven treatments were designed. The most promising treatment was when P and K were increased and micronutrients were added based on soil testing. This treatment resulted in the highest yield with better grain contents of protein and nutrients which indicated that soil-test based on fertilizer use was superior. soil analysis at the end of the experiment showed higher P and K contents. This approach could be adopted for regions with similar soil conditions in other parts of the world.

关键词： soil testing Macro & Micro Nutrients Fertilizer Use Maize

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soil CARBON CHECK:A TOOL FOR MONITORING AND GUIDING soil CARBON SEQUESTRATION IN FARMER FIELDS

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Frontiers of Agricultural Science and Engineering 2023年第2期10卷 248-261页

作者： Jan Adriaan REIJNEVELD Martijn Jasper van OOSTRUM Karst Michiel BROLSMA Oene OENEMA Eurofins International Agro Competence Center Binnenhaven 56709 PD Wageningenthe Netherlands Wageningen Environmental Research Wageningen University&ResearchP.O.Box 476700 AA Wageningenthe Netherlands

In 2015,17 Sustainable Development Goals(SDGs)were approved,including SDG13,which addresses actions to increase carbon capture(CO_(2)-C storage)for climate change ***,no analytical procedures have been defined for quantifying soil organic carbon(SOC)*** paper presents a rapid tool for guiding farmers and for monitoring SOC sequestration in farmer *** tool consists of multiconstituent soil analyses through near-infrared spectroscopy(NIRS)and an SOC mineralization *** tool provides forecasts of SOC sequestration over *** analyses by NIRS have been calibrated and validated for farmer fields in European countries,China,New Zealand,and *** indicate a high accuracy of determination for SOC(R^(2)≥0.93),and for inorganic C,soil texture,and soil bulk *** oxidizable soil C is used as proxy for active SOC,to detect early management-induced changes in SOC contents,and is also quantified by NIRS(R^(2)=0.92).A pedotransfer function is used to convert the results of the soil analyses to SOC sequestration in kg·ha^(-1)C as well as CO_(2).In conclusion,the tool allows fast,quantitative,and action-driven monitoring of SOC sequestration in farmer fields,and thereby is an essential tool for monitoring progress of SDG13.

关键词： 4 per 1000 initiative carbon sequestration climate action farmer fields SDG13 soil organic carbon soil testing

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Evaluation of H3A for Determination of Plant Available P vs. FeAlO Strips

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Open Journal of soil Science 2016年第11期6卷 175-187页

作者： Richard L. Haney Elizabeth B. Haney R. Daren Harmel Douglas R. Smith Mike J. White Grassland Soil and Water Research Laboratory USDA-ARS Temple TX USA Texas Agri Life Research and Extension Center Texas A&M University Temple TX USA

Phosphorus is an essential nutrient for plant growth but in excess is a source of environmental pollution. Fertilizer additions of P are recommended based on soil tests;however, the commonly applied P extractants are often applied outside of their design criteria (specifically soil pH). As a result, soil tests can produce inaccurate estimates of plant available P in the soil, which either increases P loss in runoff, contributing to eutrophication, or decreases crop production contributing to economic loss. In this study, 200 diverse soils from across the US were extracted with Mehlich 3, water, H3A-3, and FeAlO strips. Comparison with FeAlO was critical, as this method is accepted as the “gold standard” for plant-available P, but it is rarely used in commercial labs because of time and financial constraints. H3A-3 produced mean, median, standard deviations that are very similar to FeAlO strip results and low relative errors (2 > 0.96 with slopes 0.95 - 0.98). Although Mehlich 3 and water were correlated with FeAlO, Mehlich 3 (strongly acidic) extracted much more P than FeAlO, and water (low buffering capacity) extracted much less P across the range of soil pH values. Thus, H3A-3 provides an improved methodology to accurately determine plant-available P by mimicking root exudate action in the soil, while avoiding the time-consuming and costly FeAlO procedure. In the face of high-profile water quality impairments with enormous economic costs, such advancements are critical to balance agronomic production with environmental concerns.

关键词： soil testing soil Extraction soil Test Phosphorus

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Development and modelling of a soil nitrate and potassium simultaneous rapid detection system based on ion selective electrodes

Development and modelling of a soil nitrate and potassium si...

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The First International Conference on Computers and Computing Technologies in Agriculture

作者： LIN JIANHAN WANG MAOHUA~* ZHANG MIAO ZHANG YANE Key Laboratory on Modern Precision Agriculture System Integration Research China Agricultural University Mailing Box 125 No.17 Tsinghua East Road Beijing,PR China

Conventional soil nitrate and potassium detection methods are reliable,but time-consuming and *** lower-cost detection methods for soil nitrate and potassium are urgently needed. In this study,a temperature-calibrated soil nitrate and potassium rapid simultaneous detection system was developed based on two ion-selective electrodes (ISEs).At room temperature,the potentiometric experiments were conducted to evaluate the performance of both ISEs and simple linear regression (SLR)was used for *** lower detection limits of both ISEs were 1×10mol/litre with regression coefficients of 0.994 and 0.997,respectively. Under different temperatures,the potentiometric experiments were conducted and multiple SLRs were used for temperature-calibrated modelling with a maximum relative error of c.6%and c. 10%,*** ISE signal acquisition system was developed based on a microprocessor,including an ISE signal conditioning unit and a temperature measurement unit using a thermal *** study might be suitable for in-field soil nitrate and potassium rapid detection application.

关键词： ion selective electrode nitrate potassium soil nutrient ion concentration rapid detection soil testing

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soil Acidity： Is It a Problem in Large Scale Commercial Farms in Zimbabwe？

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Journal of Agricultural Science and Technology 2011年第2期5卷 168-174页

作者： T. P. Tauro F. Mapanda, G. Mtombeni A. Shumba D. K. C. Dhliwayo Department of Research and Specialist Services Chemistry and Soil Research Institute Fifth Street Extension P.O. Box CY550Causeway Harare Zimbabwe

A study was conducted to identify the causes of low crop yield on a large scale commercial farm in Zimbabwe. soil and water samples were collected from fields (0-60 cm) and the dam used for irrigation, respectively. soil samples were analysed for soil fertility characteristics while the water was analysed for irrigation quality. The soils on the farm were heavy, ranging from sand loams to sand clays and fertile (> 40 mg kg-1 N and > 20 mg kg-1 available P) indicating high fertilizer utilization. It was also noted that 50% of the fields on the farm had soil pH below 5.0 despite having high basic cation (Ca = 10-18 meq% and Mg = 4-7 meq%). A similar trend was observed down the soil profile (30-60 cm). The soil also had extremely high concentration of iron (> 200 ppm), manganese (> 400 ppm) and sulphate (> 4000 ppm). These findings suggest that the extreme acidity under these soils is the outcome of the exposure of pyrite to moisture and air by tillage of the land. The water used for irrigation was established to be medium saline and alkaline (pH > 7.6). This pyrite induced acidity could not be neutralised by the water from the dam and the high exchangeable bases in the soil. Such problems can possibly be managed by growing tolerant crops. soil testing on commercial farms is vital for identifying such problems in commercial farms in Zimbabwe.

关键词： soil acidity pyrite commercial farming area soil testing

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