WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Wednesday, January 17, 2018

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Search results on 01/17/18

493. Arthur, Tom. Feb. 1989. Precision application with Spud-Tech.. American Vegetable Grower, p. 14-17..
A Wisconsin company has developed a computer software system and variable fertilizer applicator for use on farm fields. Soil samples are taken for every 2.3 acres to generate a nutrient map, which is loaded into a PROM chip. The chip is inserted into the on-board computer on the Spud-Nik applicator rig, which can vary the rates of six different materials. Both fertilizer and pesticides can be varied according to soil parameters.

2385. Hammond, M.W. and D.J. Mulla. 1989. Field variation in soil fertility: its assessment and management for potato production.. Presentation at 28th annual WA Potato Conference.
Spatial variability in potato fields for P and K is common and can lead to yield and quality reductions. The potential for variable fertilizer application allows for an efficient solution to the problem, both from an economic and environmental standpoint. The paper presents an example from an irrigated circle in the Columbia Basin. Fertility maps of the field are presented, showing the spatial variability. This information is used to delineate fertility management zones, which receive different rates. Fertilizer efficiency is shown for both the conventional and variable methods. The variable method increased fertilizer costs about $10/ac. on a 200' grid system, where both P and K were mapped. The program will normally increase profits well beyond this expense.

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