Judul: The pH value and EPC of Pe&s in its retafian with Fe+ sorption and efficiency of P
Abstrak: Peatkjlnds in Indonesian cover a significant part of the W lands of the country which a w n t for lhe Iargest trow pats amounting to about 16 mitliion hectares, The most of w a n d s in this country that suitable fur ag&utturai crop have k n cuttinrated by fanner fur paddy. Be- nutrient ddldencbs, the dewlopm63nt of peatfands for agriculture fac;ss a M of cwiirtrains which are assosiated with the inherent propribs and behawbur of peatlands. One of the important chmiml aspect in soil management which has nat begn yet much attended in m n d is soil P C in its ref- with ~ e r * sorptian and P Mdency. Peatsoils contain the high organic acids and Rave #e varfabd charges (pH depsndmt) wMcR are domi&& the negative charges. Therefore, pcsatswls have the low capacity of anion sorp$on, The aims of the resemh are as fotlow (1) to know jlPC value of coastal, trsntional, and inland peals respectively in the degree of dmpositian of saw, hmic, and fibric. (2) ta study kvd uf ~ e *so rption at pHzpcs under pHpC and a - pHz* on the various physiography and decumposition degm of past sdis (3) to study relationship between the actual pH and P C with fhe increase of Fe3+ surpfion and &Wency of P. This research consists of severat experimental steps as fdlow: (1) debmining of ZPC value, (2) measufing uf ~ e *so rption, (3) measuring of Mciency of P. Sail samples were taken from Jam& and Central Kalimantan that representative for coastal , trantional, and inland peat$ rspe&v&y in the degree of dewrnpasition of sapfic, hemic, and fibk. Based an the result exprimnb were concluded: (1) on the same decomposition dwm, 2% value uf coastat peat was higher than that in tiantianal and inland peats . (2) in the same /&on and the same decomposition degree, the sorption of ~e*abuve pHtK was higher than under pHzpc; Few sorption in the cuasfaf geaf higher than that in trantional and inland pats; and ~ e s*ow n in ihe sapric peat was higher than that in irenic and fib& pats. (3) Mciency d P in the cuastal pat was higher than that In trantEanal and inland pests, but the increase of efficiency of P with Fe* addition in the inland peat was higher than that in tranfionaf and coastal peats.
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Judul: Nilai Zero Point of Charge (ZPC) serta  hubungannya dengan erapan kalium  pada tanah gambut Pantai Jambi dan  Kalimantan Tengah
Abstrak: One of the important chemical aspect is peatland management which has not been paid attention to is Zero Point of Charge (ZPC). By determining soil ZPC value, the sorption and bounding of cations can be estimated in certain pH value. Low of Kalium (K) is the one of other problems of peatland. This nutrient is easily leaching from peat because of the weakness bounding. This research is aimed to determine ZPC value, maximum sorption of K and bounding form of K being contained by the coastal peats of Jambi and Central Kalimantan with decomposition degrees of sapric, hemic, and fibric.
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Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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