Mapping Soil Test Phosphorus and Potassium for Variable-Rate Fertilizer Application

jpa ◽  
1994 ◽  
Vol 7 (4) ◽  
pp. 441-448 ◽  
Author(s):  
N. C. Wollenhaupt ◽  
R. P. Wolkowski ◽  
M. K. Clayton
Keyword(s):  
Fertilizer Application ◽  
Soil Test ◽  
Variable Rate ◽  
Phosphorus And Potassium ◽  
Soil Test Phosphorus

Factors Affecting Change in Soil Test Phosphorus Following Manure and Fertilizer Application

2007 ◽  
Vol 71 (4) ◽  
pp. 1225-1232 ◽  
Author(s):  
V. R. Haden ◽  
Q. M. Ketterings ◽  
J. E. Kahabka
Keyword(s):  
Fertilizer Application ◽  
Soil Test ◽  
Factors Affecting ◽  
Soil Test Phosphorus

Soil test phosphorus crop response projections to variable rate application in winter wheat

1998 ◽  
Vol 29 (11-14) ◽  
pp. 1731-1738 ◽  
Author(s):  
Michael W. Goedeken ◽  
Gordon V. Johnson ◽  
William R. Raun ◽  
Steven B. Phillips
Keyword(s):  
Winter Wheat ◽  
Soil Test ◽  
Variable Rate ◽  
Crop Response ◽  
Variable Rate Application ◽  
Soil Test Phosphorus

scholarly journals Impact of Soil Test Based Fertilizer Application on Yield, Soil Health and Economics in Rice

2021 ◽  
Vol 57 (4) ◽  
pp. 147-149
Author(s):  
M. Jayalakshmi ◽  
G. Prasadbabu ◽  
B. H. Chaithanya ◽  
R. Bindhupraveenaand ◽  
T. Srinivas
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Farmyard Manure ◽  
Soil Health ◽  
Fertilizer Application ◽  
Soil Test ◽  
Organic Carbon Content ◽  
Yield Increase ◽  
Net Returns ◽  
Phosphorus And Potassium

Frontline demonstrations were carried out to study the soil test-based fertilizer application on yield, soil health and economics in rice during the kharif seasons of 2017, 2018 & 2019 in farmers’ fields of Kurnool district of Andhra Pradesh. The demonstrations conducted in ten locations revealed that application of nitrogen, phosphorus and potassium based on soil test values resulted in an average yield increase of 5.01 per cent over the farmer’s practice. Demonstration plots recorded an average B: C ratio of 2.9 against farmers’ practice of 2.4 and the technology index reduced from 3.84 to 1.53 per cent. The organic carbon content increased from 0.45 to 0.50 per cent due the application of farmyard manure based on soil test value. The soil test based fertilizer application resulted in higher yield, net returns, B:C ratio and organic carbon content and low technology index indicates the feasibility of technology to adopt at farmers’ level.

scholarly journals Over-Fertilization Does Not Build Soil Test Phosphorus and Potassium in Ohio

2018 ◽  
Vol 110 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Anthony M. Fulford ◽  
Steve W. Culman
Keyword(s):  
Soil Test ◽  
Phosphorus And Potassium ◽  
Soil Test Phosphorus

scholarly journals Corn Stover Removal Responses on Soil Test P and K Levels in Coastal Plain Ultisols

2021 ◽  
Vol 13 (8) ◽  
pp. 4401
Author(s):  
Jeffrey M. Novak ◽  
James R. Frederick ◽  
Don W. Watts ◽  
Thomas F. Ducey ◽  
Douglas L. Karlen
Keyword(s):  
Coastal Plain ◽  
Nutrient Removal ◽  
Fertilizer Application ◽  
First Year ◽  
Soil Test ◽  
Concentration Data ◽  
Extractable P ◽  
K Fertilizer ◽  
Soil Test P ◽  
K Concentration

Corn (Zea mays L.) stover is used as a biofuel feedstock in the U.S. Selection of stover harvest rates for soils is problematic, however, because excessive stover removal may have consequences on plant available P and K concentrations. Our objective was to quantify stover harvest impacts on topsoil P and K contents in the southeastern U.S. Coastal Plain Ultisols. Five stover harvest rates (0, 25, 50, 75 and 100% by wt) were removed for five years from replicated plots. Grain and stover mass with P and K concentration data were used to calculate nutrient removal. Mehlich 1 (M1)-extractable P and K concentrations were used to monitor changes within the soils. Grain alone removed 13–15 kg ha−1 P and 15–18 kg ha−1 K each year, resulting in a cumulative removal of 70 and 85 kg ha−1 or 77 and 37% of the P and K fertilizer application, respectively. Harvesting stover increased nutrient removal such that when combined with grain removed, a cumulative total of 95% of the applied P and 126% of fertilizer K were taken away. This caused M1 P and K levels to decline significantly in the first year and even with annual fertilization to remain relatively static thereafter. For these Ultisols, we conclude that P and K fertilizer recommendations should be fine-tuned for P and K removed with grain and stover harvesting and that stover harvest of >50% by weight will significantly decrease soil test M1 P and K contents.

On-the-go variable rate fertilizer application on vineyard using a proximal spectral sensor

2020 ◽  
Author(s):  
Marco Sozzi ◽  
Enrico Bernardi ◽  
Ahmed Kayad ◽  
Francesco Marinello ◽  
Davide Boscaro ◽  
...  
Keyword(s):  
Fertilizer Application ◽  
Variable Rate

Nozzles for Variable Rate Fertilizer Application

2008 ◽  
Author(s):  
Geetika Dilawari ◽  
Randal K Taylor ◽  
John B Solie ◽  
Praveen Bennur
Keyword(s):  
Fertilizer Application ◽  
Variable Rate
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