Agricultural land conversion occurred as a logical consequense of development activities in a particular region. As a matter of fact, land conversion has mostly generated negative impact in the context of food security and farmer's socio economic condition. The studies of macro aspects on land conversion have been conducted frequently but studies on micro aspects were still rarely carried out. The objectives of this research are: 1) determining factors that influence agricultural land conversion, and 2) determining impact of agricultural land conversion toward farmer's welfare. The research was conducted at Lembang and Parongpong Sub District, Bandung Regency from June to August 2004. Primary data was collected through a survey on 61 farmers and secondary data from related institutions were utilized. The data was analyzed using : 1) descriptive analysis; 2) multiple linear regression; and 3) logistic binary regression. This study revealed that agricultural land conversion at Lembang and Parongpong Sub Districts within a decade, from 1992 to 2002 was 3.134,49 hectare (25%) or 313,5 hectare per year (2,96 %). Forest land use was greatly decreased (-3.732,12 hectare or -68 %), bushes land use was highly increased (2.780,23 hectare or 13.26 %). Influential factors for the conversion were: (a) the density of population in 1992, (b) the density of agricultural land owners in 1992, (c) the density of agricultural land non-owners in 1992, the density increase of agricultural land non-owners, (d) the percentage of 'idle' land acreage and its increasing rate, (e) the number of poor people, (f) the village-sub district town distance. In general, agricultural land conversion would increase the probability of farmer's welfare degradation. Key words : land conversion, welfare, farmer ABSTRAKKonversi lahan pertanian terjadi sebagai konsekwensi logis dari perkembangan wilayah. Konversi lahan pertanian seringkali menimbulkan dampak negatif terutama dalam konteks ketahanan pangan dan kondisi sosial ekonomi petani. Studi dalam aspek makro terhadap konversi lahan pertanian telah banyak dilakukan, tetapi studi dalam

Sistem irigasi berselang dan jarak tanam legowo 2:1 diduga dapat meningkatkan produktivitas padi dan menurunkan emisi Gas Rumah Kaca (GRK). Penelitian bertujuan mengetahui pengaruh sistem irigasi berselang dan jarak tanam legowo 2:1 terhadap produktivitas padi  dan  emisi GRK gas CH4 (metan).  Penelitian menggunakan rancangan petak terpisah  dengan tiga ulangan. Petak utama adalah sistem irigasi berselang (I) meliput: I1 = Irigasi berselang 3 hari digenangi; 3 hari dikeringkan (3:3); I2 = Irigasi berselang 5 hari digenangi; 3 hari dikeringkan (5:3); I3 = Irigasi berselang 7 hari digenangi; 3 hari dikeringkan (7:3). Anak petak adalah jarak tanam legowo 2:1 terdiri atas: L1 = Legowo 2:1 (25 x 15 x 50 cm); L2 = Legowo 2:1 (25 x 12,5 x 50 cm); L3 = Legowo 2:1 (25 x 15 x 40 cm); dan L4 = Legowo 2:1 (25 x 12,5 x 40 cm). Pengumpulan data meliputi: emisi gas CH4; pertumbuhan tanaman; bobot 1.000 butir; hasil padi. Data dianalisis dengan Analysis of Varians, uji nilai tengah Duncan. Hasil penelitian menunjukkan tidak terjadi interaksi antara irigasi berselang dengan jarak tanam legowo 2:1 terhadap emisi gas metan. Irigasi berselang 5 hari digenangi; 3 hari dikeringkan (5:3) dapat menurunkan emisi gas metan dan meningkatkan produktivitas padi 17,2% dari 5,88 menjadi 6,89 t/ha. Jarak tanam legowo 2:1 yang dapat menurunkan emisi gas metan adalah 25 x 15 x 40 Cm, sedangkan yang dapat meningkatkan produktivitas padi adalah 25 x 12,5 x 40 cm, yaitu sebesar 13,6% dari 6,04 menjadi 6,86 t/ha Gabah Kering Giling (GKG).

Pengembangan komoditas padi sawah yang berorientasi agribisnis seharusnya  didukung oleh alat dan mesin pertanian antara lain traktor moda dua. Kajian ini dilakukan untuk mengevaluasi tingkat penggunaan,  keragaan dan kelayakan penggunaan traktor roda dua di lahan  padi sawah  di Jawa Barat. Kajian ini juga bertujuan untuk membuat pendekatan  pengembangan traktor roda dua di Jawa Barat berdasarkan kenyataan di lapangan dan kebijakan pemerintah. Kajian ini dilaksanakan melalui metode Pemahaman Pedesaan  Partisipatif dan survey terstruk-tur. Hasil pengkajian menunjukkan bahwa ketersediaan traktor relatif memadai dengan tingkat partisipasi rumah tangga pengguna di musim hujan dan kemarau masing-masing  96 % dan 97 %. Usaha jasa traktor layak diusahakan karena  mem-berikan nilai Revenue-Cost Rasio 1,36 dan Pay Back Period 2,74 per tahun dan titik Impas 30,77 ha/tahun. Pada penelitian ini, beberapa masalah sosial, budaya dan teknis dalam pengembangan traktor roda dua pada padi sawah di Jawa Barat telah diinventarisasi.

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Agricultural land conversion is considered as one of an important issus in the developing areas. In spite of theimportance of informations on the quantity and the rate of land conversion as the basis of formulating the agricultural landconversion policy, those informations are limited. This research was conducted at Lembang and Parongpong Sub-District,Bandung District. The objectives of research are to identify the rate of agricultural land conversion and to measure thedynamic change of land use. Land use in 1992 and 2002 was evaluated by interpretating the result of 1992 and 2002 landsatimage using Geographic Information System (GIS) program. Shift Share analysis was conducted to know the dynamic changeof land use. Results of the study indicated that land conversion at Lembang and Parongpong Sub-District during the period of1992-2002 (ten years) about 3,134.49 ha (25%) or 313.5 ha (2,96%) per year. Forestland reduced the most, from 5,470 ha in 1992 to 1,746 ha in 2002 or reduced about 3,732.12 ha (68%) in ten years. While area of the bush was increased about2,780.20 ha (1,326%) during the same period, from 210 ha in 1992 to 2,990 ha in 2002. Low land was decreasedfrom 252 hain 1992 to 95 ha in 2002, up land was decreased from 3,856 ha in 1992 to 2,736 ha in 2002, mix farming was increasedfrom2,491 ha in 1992 to 4,358 ha in 2002, resettlement was increased from 359 ha in 1992 to 1,612 ha in 2002, bare wasdecreasedfrom 1,115 ha in 1992 to 217 ha in 2002, lake was decreasedfrom 52 ha in 1992 to 50 ha in 2002.