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Muhdan Syarovy
Indonesian Oil Palm Research Institute
Agriculture, Biological Sciences & Forestry

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PERBAIKAN SIFAT-SIFAT DAN PENCEGAHAN HIDROFOBISITAS TANAH GAMBUT DI PERKEBUNAN KELAPA SAWIT MELALUI APLIKASI TERAK BAJA Winarna Winarna; Iput Pradiko; Muhdan Syarovy; Fandi Hidayat
Jurnal Penelitian Kelapa Sawit Vol 24 No 1 (2016): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (172.933 KB) | DOI: 10.22302/iopri.jur.jpks.v24i1.5

Abstract

Development of oil palm plantation on peatland was faced with hydrophobicity problem caused by over drained. Hydrophobicity could reduce water retention and nutrient availability in the peat soil. Beside of proper water management application, addition of soil ameliorant which contain iron could increase stability and improve peat soil fertility. The study was conducted to obtain the effect of steel slag on peat soil properties and hydrophobicity. In this study, peat soil was incorporated with steel slag and incubated in 60 days period. The research was employed completely randomized design (CRD) factorial 2 x 2 x 4. First factor is peat maturity consists of two levels: sapric (S) and hemic (H), while the second factor is soil moisture which also consist of two levels: field capacity (W1) and dry (under the critical water content) (W2). The third factor is steel slag dosage which consist of four levels: 0 g pot (TB0), 7.17 g pot (TB1), 14.81 g -1 -1 pot (TB2), and 22.44 g pot (TB3). The result showed that application of steel slag significantly increase of soil pH, ash content, and water retention at pF 4.2. Furthermore, application of steel slag significantly reduce time for water reabsorption (wettability) in sapric. On the other hand, there are negative corellation between water penetration and soil pH, ash content, and water retention at pF 4.2. Overall, application of steel slag could increase wettability and prevent peat soil hydrophobicity.
KESUBURAN TANAH DAN LAJU FOTOSINTESIS TANAMAN KELAPA SAWIT YANG MENUNJUKKAN GEJALA WHITE STRIPE PADA LAHAN GAMBUT DI LABUHAN BATU Edy Sigit Sutarta; Muhdan Syarovy
Jurnal Penelitian Kelapa Sawit Vol 27 No 2 (2019): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2049.624 KB) | DOI: 10.22302/iopri.jur.jpks.v27i2.78

Abstract

White stripe is the loss of green pigment with elongated shape on left and right side of the mid-rib. White stripe is often associated with an imbalance in the N/K nutrient ratio in oil palm. This study aims to determine soil fertility, growth, and photosynthesis rate of oil palm that expressing white stripe symptoms on Fluvaquentic Haplosaprists in Labuhan Batu, North Sumatra. This research was conducted by observing the ecophysiology of 3 plant conditions consisting of a) healthy oil palms, b) oil palms expressing white stripe symptoms, and c) oil palms expressing Boron deficiency symptoms. The results showed that peat soil at the research site has good fertility status. Soil fertility of all treatments are similar except its available nutrients, where the oil palms expressing white stripe symptoms have average P available, K, Ca, Na, and Mg exchanged lower than healthy oil palms as well as oil palms expressing Boron deficiency symptoms. Oil palms expressing white stripe symptoms have low leaf N/K rasio (2.19), and have no relation with Boron deficiency, with unsignificant leaf area indeks (LAI) compared to other treatments. Low chlorophyll content of oil palms expressing white stripe and Boron deficiency symptoms have affected to low rate of photosynthetic rate and, If not corrected immediately, white stripe and also boron deficiency will affect to oil palm growth and productivity.
Co-Authors Edy Sigit Sutarta Fandi Hidayat Iput Pradiko Winarna Winarna