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Silwanus M. Talakua
University of Pattimura

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DEVELOPMENT OF A LAND DEGRADATION ASSESSMENT MODEL BASED ON FIELD INDICATORS ASSESSMENT AND PREDICTION METHODS IN WAI SARI, SUB-WATERSHED KAIRATU DISTRICT, WESTERN SERAM REGENCY, MALUKU PROVINCE, INDONESIA Silwanus M. Talakua; Rafael M. Osok
SCIENCE NATURE Vol 2 No 1 (2019): SCIENCE NATURE
Publisher : Faculty of Mathematics and Natural Sciences, University of Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/SNvol2iss1pp071-085year2019

Abstract

The study was conducted in Wai Sari sub-watershed, Western Seram Regency Maluku to develop an accurate land degradation assessment model for tropical small islands. The Stocking’s field land degradation measurement and RUSLE methods were applied to estimate soil loss by erosion and the results of both methods were statistically tested in order to obtain a correction factor. Field indicators and prediction data were measured on 95 slope units derived from the topographic map. The rates of soil loss were calculated according to both methods, and the results were used to classify the degree of land degradation. The results show that the degree of land degradation based on the field assessment ranges from none-slight (4.04 - 17.565 t/ha/yr) to very high (235.44 - 404.00 t/ha/yr), while the RUSLE method ranges from none-slight (0.04-4.59 t/ha/yr) to very high 203.90 - 518.13 t/ha/yr. However, the RUSLE method shows much higher in average soil loss (133.4 t/ha/yr) than the field assessment (33.9 t/ha/yr). The best regression equation of logD/RP = - 0.594 + 1.0 logK + 1.0 logLS + 1.0 logC or D = 0.2547xRxKxLSx CxP was found to be a more suitable land degradation assessment model for a small-scale catchment area in the tropical small islands.
INFLUENCE OF ORGANIC FERTILIZER SAGO COMPOST ON ULTISOLS SOIL PHYSICAL PROPERTIES OF TELAGA KODOK SUB VILLAGE IN HITU VILLAGE OF CENTRAL MALUKU DISTRICT AND THE CORN (Zea Mays Ceratina) CORPS PRODUCTION Silwanus M. Talakua; Elizabeth Kaya
SCIENCE NATURE Vol 2 No 1 (2019): SCIENCE NATURE
Publisher : Faculty of Mathematics and Natural Sciences, University of Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/SNvol2iss1pp042-056year2019

Abstract

This study aims to prove that the giving of organic fertilizer sago compost can improve soil physical properties and improve yields of maize crops on Ultisols. This research was conducted in Telaga Kodok Subvillage, Hitu Village Central of Maluku District in April 2016 until its completion. Soil analysis was conducted at Balai Penelitian Tanah Bogor. This research used Factorial Random Block Design which consist of one factor and repeated three times with compost dosage of sago compost is K0 (no compost), K1 (30 ton/ha), K2 (45 ton/ha), K3 (60 ton/ha ). Giving the ela sago compost can improve soil physical properties that is able to reduce the bulk density (0.73 g/cm3), particle density (1.78 g/cm3) and rapid drainage pores (7.69%) and able to improve/increase moisture content of field capacity (43.91%) and water available pore (17.00%). The ela sago compost as organic fertilizer can increase the yield of corn crop is 89,80 g/plant or 4,28 t/ha. The optimum dosage of ela sago compost as organic fertilizer found to improve soil physical properties and increase the yield of corn crop is 60 t/ha.
Co-Authors Elizabeth Kaya Osok, Rafael M