Minimum tillage systems
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CTA. 1987. Minimum tillage systems. Spore 10. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/44681
how deep should soil testing go ?
A major problem in evaluating soil fertility is the choice of an appropriate soil sampling methodology for minimum-till soils. How many soil samples should be taken and at what depth ? Specialists from universities and private soil testing laboratories agreed on the necessity of two sampling depths. Because of the different fertilizer, pH and organic matter strata in minimum-till soils, two samples -one near the surface to determine pH and organic matter levels, and one deeper to obtain a general fertilizer recommendationare required. The top sample gives an idea of what kind of fertilizer application it will take to optimize early season nutrient uptake in the crop. The deeper sample shows the benefits the plant obtains at a more mature stage. For further information: Farm Chemicals International Summer issue 1987