تلخیص
Soil samples from a farmer's field at Khutti village in Dera Ismail Khan
district of North West Frontier Province were collected at a regular grid spacing ofv50m x 15m to prepare maps of major plant nutrients for variable-rate fertilizervmanagement. All the soil samples were analysed for pH, lime, organic matter,vtexture, mineral A1, and AB-DTPA extractable P and K. A uniformity trial was laidvout on wheat with a uniform rate of 120-90-60 kg N-P2Os-K20 ha'. The soil was
alkaline, highly calcareous, low in organic matter, and adequate in P and K.vHowever, there was considerable variation in soil P, ranging from 2.06 to 10.82 mgvkg' with a mean of 5.72 mg kg'' and a coefficient of variation (CV) of 45.3%. Thisvwas followed by mineral N (CV-3S.2%). Similarly grain yield had a considerablevvariation, ranging from 3 to 6 t ha' with a mean of 4.365 t ha~' (CV-24.1%).vGeostatistical technique of semivariogram analysis showed that sand content andvgrain yields were spatially distributed in the field. Maps of soil fertility and crop
productivity of the farm were prepared using the geostatistical technique of kriging.vBased on these maps, the farm was divided into different zones for fertilizer management.
Aman Ullah Bkatti, Ahmad Bakhsh, Muhammad Afzat, Akbar Hussain Gurmani. (1999) MAPPING OF MAJOR PLANT NUTRIENTS AND CROP PRODUCTIVITY USING GEOSTATISTICAL TECHNIQUES FOR FERTILIZER MANAGEMENT, The Journal Soil & Environment , Volume 16, Issue (1-2).
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