| Summary: | Coastal sandy soils have low fertility because most nutrients, mainly N losses due
to leaching and evaporation. Appropriate technology to reduce N losses and increase
the growth of citrus seedlings in the coastal sandy soil lined with using fertilizer
Phonska coated with neem seed extract and zeolite that is slow release. This main
research aimed to study the effects of fertilizer dose Phonska Zeoneem the
availability of N, P, K soil and N,P,K uptake of citrus seedlings, studying the vertical
distribution of nitrogen and find the optimum dose of Phonska Zeoneem fertilizer for
the growth of citrus seedlings. Field experiments conducted in the coastal sandy land
Bugel, Kulonprogo while soil and plant analysis performed at the Laboratory of
Chemistry and Fertility, Department of Soil, Agriculture Faculty, Gadjah Mada
University in June-December 2010. The material used is a fertilizer Phonska,
Phonska Zeoneem, cow manure, citrus seeds and sandy soil. Experiment based on
randomized block design with one treatment factor consisting of five level that is the
control, fertilizer Phonska, Phonska Zeoneem at 60%, 80% and 100% dosage
recommendations. Fertilization is done every 2 months.
The results showed that Phonska Zeoneem fertilizer application significantly able
to increase the availability of N, P, K in soil and uptake of N, P, K plant and is able to
enhance the growth of citrus seedlings. Vertical distribution of nitrogen (N-NH4 and
N-NO 3) showed that fertilizer Phonska Zeoneem able to inhibit the nitrification of
nitrogen so that nitrate concentrations decreased over dept soil. Zeoneem Phonska
fertilizer at 80% dosage recommendations, equivalent to 40 g/plant per 2 months is
the optimum recommendations for fertilizing citrus seedlings in the coastal sandy
soil.
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