Variable Rate System For Side-Dressing Liquid N Fertilizer

A 3-yr field study was initiated in 1996 to examine the different grain yield and grain protein responses of wheat to varied N fertilizer rates in a typical glacial till landscape in Saskatchewan, Canada. Our objective was to assess the agronomic and economic feasibility of variable rate fertilizer (VRF) N application for wheat. Results suggest that spring soil water status largely determined the yield and the protein content of wheat both within different years of the study and between different landscape positions within a given year. Although grain yield was strongly related to spring soil water and was predictable on that basis, the grain yield response of wheat to fertilizer N additions was highly variable due, in part, to the dual role that N played in determining both grain yield and grain protein content. As a consequence of the unpredictable nature of the varied response of wheat to N fertilizer additions, there was little economic rationale for using VRF strategies in the 3 yr of this study. However, in the long-term, we believe that VRF N application strategies can be employed to manage N inputs from the perspective of managing and replacing harvested N. Key words: Variable rate fertilizer application, precision farming, nitrogen application, N fertilizer, Saskatchewan

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Development of Variable Rate System for Disinfection Based on Injection Technique

Computer and Computing Technologies in Agriculture IX - IFIP Advances in Information and Communication Technology ◽

10.1007/978-3-319-48354-2_43 ◽

2016 ◽

pp. 437-444

Author(s):

Wei Ma ◽

Xiu Wang ◽

Lijun Qi ◽

Wei Zou

Keyword(s):

Injection Technique ◽

Variable Rate ◽

Rate System

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Crop model- and satellite imagery-based recommendation tool for variable rate N fertilizer application for the US Corn system

Precision Agriculture ◽

10.1007/s11119-016-9488-z ◽

2016 ◽

Vol 18 (5) ◽

pp. 779-800 ◽

Cited By ~ 23

Author(s):

Zhenong Jin ◽

Rishi Prasad ◽

John Shriver ◽

Qianlai Zhuang

Keyword(s):

Satellite Imagery ◽

Fertilizer Application ◽

Crop Model ◽

N Fertilizer ◽

Variable Rate ◽

The Us

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Wheat yield and grain protein variation within an undulating soil landscape

Canadian Journal of Soil Science ◽

10.4141/s00-059 ◽

2001 ◽

Vol 81 (4) ◽

pp. 459-467 ◽

Cited By ~ 8

Author(s):

G. Manning ◽

L G Fuller ◽

D N Flaten ◽

R G Eilers

Keyword(s):

Grain Yield ◽

Protein Concentration ◽

N Fertilizer ◽

Grain Protein ◽

Variable Rate ◽

Soil Series ◽

Available N ◽

Grain Protein Concentration ◽

N Supply ◽

Soil Landscape

The objective of this study was to compare landform element complexes (LEC) and soil series as discrete management units for variable rate N fertilizer application. Crop response attributes including grain yield, and grain protein concentration were studied in ten intensively sampled transects in an undulating glacial till soil-landscape near Miniota, Manitoba. In 1997, a year with growing season precipitation 37% below average, median grain yield tended to increase with both N fertilizer and with convergent character in the landscape (upper < mid < lower). Varcoe soils, located predominantly within the lower LEC, were generally more productive than Newdale soils. Grain protein concentration increased with N fertilizer, but tended to decrease with convergent character in the landscape (upper > mid > lower), and was lowest in the Varcoe series. In 1998, growing season precipitation was 62% above average. Grain yield responses to N fertilizer were greater, due in part to declining N fertility in the check and 45 kg ha–1 treatments. Trends among LEC were opposite to those in 1997, as median grain yield estimates tended to decrease with convergent character in the landscape (upper > mid > lower). Grain yield was modeled as a function of estimated plant-available N supply within each LEC and soil series. Modeled 1997 grain yield maxima were 2077, 2261 and 2485 kg ha–1 in the upper, mid and lower LEC. Estimated plant-available N supply at the yield maxima were 89, 130 and 130 kg N ha–1, respectively. In 1998, the relative order of modeled maxima among LEC was reversed. Grain yield of 2501, 2355 and 2227 kg ha–1 were predicted in the upper, mid and lower LEC. Estimated plant-available N supply at the yield maxima were 146, 142 and 154 kg N ha–1, correspondingly. In 1997, plateau yields were 2379, 2495 and 2325 kg ha–1 for Newdale, Varcoe and Angusville series, respectively, where the Varcoe series responded most strongly to estimated plant-available N supply. The corresponding estimated plant-available N supply values at the modeled maxima were 195, 139 and 110 kg ha–1. In 1998, plateau yields were 2343, 2253 and 2285 kg ha–1 for Newdale, Varcoe and Angusville series, respectively. The corresponding estimated plant-available N supply values at the modeled maxima were 136, 148 and 155 kg ha–1. Successful variable-rate fertilization by LEC or soil series will require long-term empirical study to establish risk-based grain yield-N relationships, and to determine if an economic advantage over conventional fertilization practices exists. Key words: Variable-rate fertilization, nitrogen, wheat yield, grain protein concentration, soil-landscape

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