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Abstract


Variable Rate Fertilizer Control System for Centrifugal Fertilizer Spreaders
Application of fertilizer in agricultural production is one of the most important processes. Fertilizer is traditionally applied equal regardless of variability in the soil to the whole field. Soil samples are taken separately and mixed and analysed as a single sample and a single fertilization norm is recommended according to the result obtained. However, variability in the soil can be detected by sampling based on sensitive agriculture technologies and grid or soil groups. As a result, variable fertilization can be performed (Sındır and Tekin, 2002). Variable rate application (VRA) is application of information technologies such as global positioning system (GPS), geographic information system to farm management (Blackmore, 1999). It is very difficult to reconstitute the natural balance that is deteriorated as a result of environmental pollution caused by the unconscious use of mineral fertilizers. Taking necessary precautions is very important to prevent excessive chemical fertiliser usage (Bellitürk, 2005). The use of variable rate of nitrogen (N) in the field increases crop yield, reduces nitrate pollution of groundwater and farming costs (Kim et al., 2002). Nitrogen fertilizer in 50.5 kg versus 101 kg per hectare it is used twice in Thrace Turkey (Bayraktar, 1997). Blackmore et al. (1994) reported that fertilizer spreading machines with variable rate fertilizer control system can be successfully used in applying fertilizers as variable rate. Bongiovanni and DeBoer (2000) carried out field experiments for determining effects of the most applied nitrogen doses in corn production. In the first year the data showed that the nitrogen effect varied considerably according to the terrain and that variable rate fertilizer application technology was more profitable than nitrogen fertilizer application uniformly applied at 80 kg / ha. Godwin et al. (2002) reported that variable rate nitrogen application provided an economic gain of 22 pounds per hectare in 2000.

Keywords
centrifugal fertiliser spreader, precision farming, variable rate fertilisation


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