Testing Soils for Potassium, Calcium, and Magnesium

Haby, V. A.; Russelle, Michael P.; Skogley, E. O.

doi:10.2136/sssabookser3.3ed.c8

“…Soil samples from the 0-to 30-cm soil layer for each plot were collected before planting in 2012 and 2013, air-dried, sieved to pass through a 1-mm screen, and analyzed for organic matter (Yeomans and Bremner, 1988), total N (Bremner, 1996), extractable Olsen-P (Fixen and Grove, 1990), ammonium acetate-extractable K (Haby et al, 1990), and pH (1:2.5, soil/water).…”

Section: Soil Analysismentioning

confidence: 99%

Multisplit Nitrogen Application via Drip Irrigation Improves Maize Grain Yield and Nitrogen Use Efficiency

Zhou

¹

,

Sun

²

,

Ding

³

et al. 2017

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Conventional fertilization with most N applied before or during early maize (Zea mays L.) growth stages can negatively affect production if soil N is insufficient after silking. Here, drip irrigation with a split application of N (drip fertigation) was evaluated to determine whether the effect on yield and N use efficiency (NUE) differs with cropping practice. Compared with conventional fertilization, drip fertigation increased yield by 13 and 14% at a low planting density under a low N rate (L) and by 15% at a high planting density under a high N rate (H) in 2012 and 2013, respectively. Yield increases under drip fertigation were attributed to 18 and 17% increases in postsilking dry matter (DM) accumulation under L, and 12 and 10% increases in presilking DM accumulation, and 17 and 16% increases in postsilking DM accumulation under H in 2012 and 2013, respectively. Increased postsilking N accumulation under drip fertigation, promoted by greater root length and soil mineral N after silking, maintained increased leaf area index (LAI) and DM accumulation rate to improve postsilking DM accumulation under L. Greater N accumulation under drip fertigation from the 12‐leaf stage to silking and after silking promoted greater LAI and DM accumulation rate to increase pre‐ and postsilking DM accumulation under H. Because of greater grain yield and N uptake and less water consumption, drip irrigation improved NUE and irrigation water use efficiency. Drip fertigation can effectively improving maize grain yield and NUE resulting from improved DM accumulation with increased early‐season N uptake.

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“…Soil tests measure the quantity of nutrient element that is extracted from a soil by a particular extracting solution. The measured quantity of extractable nutrient in a soil is then used to correlate with nutrient uptake and thus to predict the crop yield in response to application of the nutrient as a fertilizer, organic manure, or other amendments [1]. An assessment of the nutrient status in the soil using conventional method requires a separate extraction and measurement process for most elements; this is costly process in terms of both time and labour [2].…”

Section: Introduction mentioning

confidence: 99%

Untitled

2019

JAST-A

0

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The research work was carried out to compare and evaluate the extractability of cationic micronutrients (Zn, Cu, Fe and Mn) using widely employed diethylene triamine pentaacetic acid (DTPA)-triethanolamine (TEA)-CaCl 2 method with that of multinutrient extractant (ammonium bicarbonate (AB)-DTPA) in Inceptisols, Alfisols and Entisols in the erstwhile united Andhra Pradesh. The percent variation of extraction of Zn was higher in soils with DTPA-TEA-CaCl 2 over AB-DTPA method in all the soil orders (types) in the range of 35.3% to 46.2%. AB-DTPA extracted high amounts of Cu to an extent of 10%-21% in Entisols and Alfisls, respectively. In Inceptisols both extracatants extracted equal amounts of Cu. AB-DTPA extracted high amounts of Fe 13% and 18% in Alfisols and Entisols compared to that of DTPA-TEA-CaCl 2 method and DTPA-TEA-CaCl 2 method was good extract for Fe in Inceptisols and even for Mn in Alfisols. The amounts of micronutrient contents extracted were found to be highly and significantly correlated with soil properties like electrical conductivity (EC) and organic carbon (OC). The individual micronutrient contents of Zn, Cu and Fe extracted by DTPA-TEA-CaCl 2 methods were found to be highly correlated with that of AB-DTPA extractant. However, such correlation was not observed for Mn extraction when all soils were grouped.

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“…Soil tests measure the quantity of nutrient element that is extracted from a soil by a particular extracting solution. The measured quantity of extractable nutrient in a soil is then used to correlate with nutrient uptake and thus to predict the crop yield in response to application of the nutrient as a fertilizer, organic manure, or other amendments [1]. An assessment of the nutrient status in the soil using conventional method requires a separate extraction and measurement process for most elements; this is costly process in terms of both time and labour [2].…”

Section: Introduction mentioning

confidence: 99%

Untitled

2018

JAST-A

0

View full text Add to dashboard Cite

The research work was carried out to compare and evaluate the extractability of cationic micronutrients (Zn, Cu, Fe and Mn) using widely employed diethylene triamine pentaacetic acid (DTPA)-triethanolamine (TEA)-CaCl 2 method with that of multinutrient extractant (ammonium bicarbonate (AB)-DTPA) in Inceptisols, Alfisols and Entisols in the erstwhile united Andhra Pradesh. The percent variation of extraction of Zn was higher in soils with DTPA-TEA-CaCl 2 over AB-DTPA method in all the soil orders (types) in the range of 35.3% to 46.2%. AB-DTPA extracted high amounts of Cu to an extent of 10%-21% in Entisols and Alfisls, respectively. In Inceptisols both extracatants extracted equal amounts of Cu. AB-DTPA extracted high amounts of Fe 13% and 18% in Alfisols and Entisols compared to that of DTPA-TEA-CaCl 2 method and DTPA-TEA-CaCl 2 method was good extract for Fe in Inceptisols and even for Mn in Alfisols. The amounts of micronutrient contents extracted were found to be highly and significantly correlated with soil properties like electrical conductivity (EC) and organic carbon (OC). The individual micronutrient contents of Zn, Cu and Fe extracted by DTPA-TEA-CaCl 2 methods were found to be highly correlated with that of AB-DTPA extractant. However, such correlation was not observed for Mn extraction when all soils were grouped.

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Testing Soils for Potassium, Calcium, and Magnesium

Cited by 69 publications

References 102 publications

Multisplit Nitrogen Application via Drip Irrigation Improves Maize Grain Yield and Nitrogen Use Efficiency

Multisplit Nitrogen Application via Drip Irrigation Improves Maize Grain Yield and Nitrogen Use Efficiency

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