Abstract
The poultry manure and vertisols matter have potency for reclaiming a soil. The research objectives was to study the effect of poultry manure (PM) and vertisols matter (VM) on availability and leaching of macro nutrient in coastal sandy soil treated by rainfall simulation. A laboratory experiment was conducted with lesymeters to measure nutrient leaching. The factorial 4 × 4 treatment applied was arranged by randomized completely block design with three replications. The first factor was level of PM consisted of 0, 20, 40, and 60 Mg ha-1. The second one was the level of VM consisted of 0, 5, 10, and 15%. Variables observed were soil physical and chemical properties such as bulk density (BD), particle density (PD), porosity, pF 2.54, pF 4.2, available water capacity (AWC), permeability, cation exchange capacity (CEC), available macro nutrients (N, P, K, Ca, Mg, and S) by Morgan Wolf extraction, and the rate of macro nutrient leaching measuared by Spectrophotometry and Atomic Absorption Spectrophotometry. Result of the research showed that application of PM and VM in the sandy soil decreased soil PD and BD, increased soil porosity and AWC, decreased soil permeability, and slightly increased soil CEC. Application of PM and VM increased soil available nutrient in the sandy soil. Up to 60 Mg ha-1 dose PM increased soil available nutrient, while 10 to 15% dose, VM did not increased it. The rank of nutrient leaching from high to low by rain simulation was N-NO3 -> SO4 = > K+ > Ca2+. Leaching of K and N-NH4+ could be reduced by soil amendment. Combination of PM 60 Mg ha-1 and VM 10% was the best soil amendment for increasing nutrient availability and decreasing nutrient leaching in the sandy soil. Keywords: available nutrient, coastal sandy soil, leaching, poultry manure, vertisols matter
Highlights
Effort to Increase Oil Palm Production through Application Technique of Soil and Water Conservation
Objective of the study is to examine the effect of soil and water conservation measurement
namely bund terrace and silt pit that are combined with retarded-water hole on production
Summary
Penelitian dilakukan di Blok 375, 414, dan 415 atau selanjutnya disebut Blok 1, 3, dan 2, pada Afdeling 3 Unit Usaha (UU) Rejosari PT Perkebunan Nusantara (PTPN) VII, kecamatan Natar, kabupaten Lampung Selatan. Guludan dan rorak yang dilengkapi lubang resapan dibangun pada musim kemarau tahun 2005, sedangkan parameter vegetatif mulai diamati bulan Juli 2006 dan produksi secara intensif diukur dan dicatat mulai bulan Januari hingga Desember 2007. Sisa tanaman daun sawit dan semak belukar sebagian dimasukkan ke dalam lubang resapan dan bagian lainnya diletakkan pada saluran guludan. Rorak (panjang 300 cm, lebar 50 cm, dan dalam 50 cm) dibangun di antara tanaman kelapa sawit sejajar kontur dengan pola selang seling antar garis kontur. Pada setiap rorak dibuat 2 (dua) lubang resapan yang berjarak 2 m serta berdiameter dan kedalaman sama seperti pada saluran guludan. Ke dalam rorak dan lubang resapan juga ditambahkan sisa-sisa tanaman dan semak belukar sebagai mulsa. Data vegetatif dan produksi dalam bentuk tabel dan grafik dianalisis secara deskriptif dengan membandingkan angka-angka antar blok sebagai akibat penerapan perlakuan guludan dan rorak
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