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T. NOTOHADIKUSUMO
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Agriculture, Biological Sciences & Forestry

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EFFECTS OF TYPE OF PHOSPHATE ADSORBENT COMPOUND AND SOURCE OF P FERTILIZER ON PHOSPHATE SUPPLYING CAPACITY OF PEAT MATERIAL MASGANTI, .; NOTOHADIKUSUMO, T.; MAAS, A.; RADJAGUKGUK, B.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

Abstract

Peat soil has a negative charge through its functional groups such as carboxylic. On other side, phosphate is essential nutrient available in the form of anion, that the P becomes easily carried by leaching water. The use of P adsorbent compound could strengthen the bound between P anion and peat colloid, so the loss of P can be reduced. Besides that, the use of slow released P fertilizer containing adsorbent cations can also reduce the total P in the leachate. A laboratory experiment was conducted to determine kinds of adsorbent compound and source of P fertilizer which effectively increase P retention and P supplying capacity of sapric peat material from Berengbengkel, Palangkaraya, Central Kalimantan. The experiment was carried out in the Soil Laboratory, Gadjah Mada University, Yogyakarta from September until November 2001. The treatment factorsimposed were (1) kinds of adsorbent compound : CaCO3; CaSO4; CaCl2; MgCO3; MgSO4; MgCl2; K2CO3; K2SO4; KCl; Na2CO3; Na2SO4; NaCl; (NH4)2CO3; (NH4)2SO4; and NH4 Cl, and (2) source of P fertilizer: SP-36 and rock phosphate. The experiment was arranged in a randomized complete design with three replications. One hundred grams of moist sapric peat material (containing about 100% water) was mixed with adsorbent compound and 30 ?g g-1 P fertilizer, and incubated for one week. For five consecutive weeks, the peat was leached with 200 ml waterevery week. The parameters observed were P retention and supplying capacity of the peat. The results showed that P retention and P supplying capacity of the peat material were strongly affected by kinds of adsorbent compound, source of P fertilizer, and interaction of both. The P retention and P supplying capacity of the peat became maximum if using CaCO3 as an adsorbent compound and rock phosphate as a source of Pfertilizer.
The Effects of Drying and Wetting on the Soil Chemical Properties of Acid Sulphate Soils of Kalimantan M. NOOR; A. MAAS; T. NOTOHADIKUSUMO
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 27 (2008): Juli 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n27.2008.%p

Abstract

This research aimed to study the effects of land reclamation (drying, wetting, flushing, and leaching) on the change of soil chemical properties of acid sulphate soils from Kalimantan. Randomized Complete Design (RCD) by two factors treatments with two replications is used in this research. Factor I was soil reactiveness that is define as (a) low reactive= R1; (b)moderate reactive =R2; (c) strong reactive= R3, and (d) very strong reactive= R4 respectively. Factor II was drying, wetting, and diluting that is define as (1) drying continuously after wetting = W1, (2) wetting continuously = W2; (3) drying after weeting and diluting =W3; and (4) wetting and diluting. The result of experiments show that continuous drying after wetting (W1) and drying after wetting and diluting (W3) or continuous weeting (W2) gave soils pH lower than the weeting and diluting (W4).Dried on the strong reactive soils (R4) not decrease soil pH significantly. The continouos drying after wetting (W1) can increase EC (electrical conductivity) higher than the continous wetting (W2) and wetting that followed diluting (W4) or drying after wetting and diluting (W3). The continouos wetting (W2) and the continouos drying after wetting (W1) has given the total soluble acidity of 63,30 dan 61,71 cmolc kg-1 respectively, higher than drying after wetting and diluting (W3) and wetting thatfollowed diluting (W4) that given total soluble acidity of 54,03 and 51,95 cmolc kg-1 respectively. The effects of drying, wetting, flushing, and leaching on the total soluble acidity, Soluble Al and soluble H, especially on the strong reactive soils are very significant. All of the exchangeble bases (Ca, Mg, K, Na) on the continouos drying after wetting (W1) are lower than the continous wetting (W2) and wetting that followed diluting (W4)or drying after wetting and diluting (W3) respectively. The continouos drying after wetting (W1), the continous wetting (W2) and wetting that follow diluting (W4) or drying after wetting and diluting (W3) decrease exchangable Mg, especially on strong reactive soils (R4), but contradictive to low reactive soils (R1). The continouos drying after wetting (W1) increase exchangable Na, especially on low reactive soils (R1), but the wetting that followed diluting (W3, W4) decreases exchangable Na.
Co-Authors . MASGANTI A. MAAS B. RADJAGUKGUK M. Noor