Fertility Trends in the South African Sugar Industry
نویسندگان
چکیده
Since the nutrient survey of the South African sugar industry in 1970 little use has been made of analytical data for determining trends in soil fertility and plant nutnent uptake in the regional extension areas of the industry. This became possible in 1980 following computerisation of fertilizer recommendations by the Fertilizer Advisory Service (FAS)of the Experiment Station. Since then a data bank has stored information from approximately 100000 soil and about 35 000 leaf samples that have been analysed for cane growers. The data set for soils comprised information with regard to pH, the elements P, K, Ca, Mg, S, Zn and also percentage clay, P-fixation and Al toxicity. The leaf data set was .concerned with the elements N, P, K, Ca, Sand Zn. The retneval system used for providing comparative ,change~ in nutrient availability during the past eight years IS descnbed. Examples are given to show how the information may be used for extension purposes.
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