<p><em>Increasing rice production through area expansion is very difficult to do in Gunungkidul Regency. Increasing the rice cropping index is an alternative option in increasing rice production, supported by supplementary irrigation. This study aimed to determine the increase in the rice cropping index from 1 to 2 by utilizing supplementary irrigation from the Oyo River Dam. The research was conducted at Sambirejo, Watusigar Village, Ngawen Sub-district, Gunungkidul Regency, Special Region of Yogyakarta during the second planting season in 2019. During planting time, rainfall was observed to determine irrigation time. In conditions without rain, the irrigation interval was not more than 5 days. The randomized completely block design (RCBD) was used to determine the suitability variety of Inpari 19, Inpari 24, Inpari 30, Inpari 42 and Sidenuk in the conditions of the second planting season, complete with a package of rice production technology components. The data collected includes rainfall, harvest age and rice productivity. Farmers' perceptions was explored to determine acceptance of technology components. The results showed that supplementary irrigation from the Oyo River Dam was sufficient to increase the rice planting index in the second planting season. Variety of Inpari 24, Inpari 19 and Inpari 30 had high productivity, with Inpari 19 being prospectively developed for rice cultivation in the second planting season. Most farmers receive a package of technology components, but were constrained by capital for irrigation.</em></p>

This study aimed to determine the increase of rice cropping index from 1 to 2 in several rice varieties supported by river dam irrigation on dry land during the second growing season. The research was conducted in dry land in Pacarejo, Semanu, Gunungkidul, Yogyakarta, Indonesia, in March-Juli 2019 during second growing season. The increasing of rice cropping index utilized supplementary irrigation from river dam to maintain soil moisture. Rice varieties used were Inpari 24, Inpari 30, Inpari 32, and Inpari 33, complete with a package of technological components. The result showed 139 mm of rainfall with 11 rainy days, so that the most of crop water requirements came from river dam irrigation. Inpari 24 gave the highest grain yield (442.8 kg/1,000 m2) which was not different from Inpari 30 but different from Inpari 32 and Inpari 33. Inpari 24 carbon absorption was 503.8 kg/1,000 m2, consisting of 207.4 kg/1,000m2 in grain, 218.6 kg/1,000 m2 in straw, and 77.9 kg/1,000 m2 in root which was different from Inpari 32 (p<0.05; n=3). B/C Inpari 24 was 1.18 and farmers profit was Rp. 1,006,600/1,000 m2. The profit of rice cultivation in all rice varieties were higher than groundnut with higher irrigation costs.

<p><strong>Abstract</strong>. The farmers want to move from green revolution technology to other rice systems because the former is no longer sustainable.The aim of this study was to study soil chemical-physical characteristics and rice productions of three different rice farming systems. This study was carried out in Sambiredjo Sub District, Sragen Regency, arranged in randomized complete block design with three replications and as the treatments was an organic, semi organic and conventional rice system. One kilo gram composites soil samples of 0-20 cm in depth were collected from five random sampling points of every site and taken in March 2017, before soil preparation. Rice biomass productions namely rice grains, rice straw and rice residues were harvested in the end of June 2017.The results indicated that in organic field, the soil chemical-physical fertility was superior to that of in semi organic and conventional and semi organic system was better than conventional in terms of soil pH, organic C and total N, P and K total, soil bulk density, particle density, soil porosity and permeability. Similar finding was observed for rice biomass productions. The rice grains yields were 7.52±0.49, 6.40± 0.10 and 6.07±0.38, rice straw were 9.04±0.61, 8.67±0.58 and 6.87±0.72 and for rice residues were 4.82±0.48, 3.25±0.31 and 3.23±0.35 tons ha-1 season-1 for organic, semi organic and conventional systems, respectively. Compared to the conventional system, the organic increased about 23 %, 31% and 49 % for rice grains, rice straw and rice residues, respectively. Comparing conventional to semi organic, the improvement was 5 %, 26 % and 0.62 % for rice grains, rice straw and rice residues, respectively. This short term research concluded that organic rice farming was superior than both semi organic and conventional systems, but the long term effect need to be further evaluated.<br /><em><strong>Abstrak</strong></em>. Sebagian petani ingin beralih ke budidaya padi organik karena teknologi green revolution yang mengandalkan masukan tinggi dipandang tidak lumintu. Penelitian bertujuan untuk mempelajari sifat fisik dan kimia tanah serta mengetahui hasil padi dari sistem organik, semi organik dan konvensional. Penelitian dilaksanakan di Kecamatan Sambiredjo, Kabupaten Sragen dengan menggunakan rancangan acak kelompok yang diulang tiga kali, dengan perlakuan: budidaya padi organik, semi organik dan konvensional. Sebanyak satu kilo gram contoh tanah komposit dari ketiga sistem pada kedalaman 0-20 cm diambil dari lima titik secara acak, masing-masing sebelum pengolahan tanah pada bulan Maret 2017. Panen brangkasan padi, yang meliputi gabah, jerami dan sisa tanaman (akar dan potongan batang yang tertinggal) dilakukan pada akhir bulan Juni 2017. Hasil percobaan menunjukkan bahwa sifat kimia dan fisik tanah pada sistem organik lebih unggul dibandingkan dengan semi organik dan konvensional meliputi pH tanah, C organic, kandungan N, P dan K total, berat jenis, kepadatan partikel, porositas dan permeabilitas tanah. Selain itu, budidaya semi organik lebih baik dibandingkan dengan konvensional.Hasil gabah kering dari masing masing teknologi tersebut adalah 7,52±0,49; 6,40±0,10 dan 6,07±0,38, jerami sebesar 9,04±0,61, 8,67±0,58 dan 6,87±0,72 dan sisa tanaman seberat 4,82±0,48; 3,25±0,31 dan 3,23±0,35 ton ha-1musim-1pada budidaya padi organik, semi organik dan konvensional. Dibandingkan dengan budidaya konvensional, sistem organik meningkatkan gabah, jerami dan sisa tanaman berturut turut sebesar sebesar 23 %, 31 % dan 49 %. Apabila dibandingkan antara sistem konvensional dengan semi organik, juga terjadi peningkatan sebesar 5 %, 26 % dan 0.62 % untuk gabah, jerami dan sisa tanaman. Penelitian ini menyimpulkan bahwa budidaya padi organik lebih unggul dibandingkan dengan semi organik dan konvensional namun pengaruh jangka Panjang perlu dievaluasi lebih lanjut.</p>

Intercropping is an attempt to plant several types of crops on the land at the same time, arranged in such a way in a row of plants. Planting in this way can be done on two types of plants that are relatively different old. The application of Rice-Corn intercropping was carried out in Playen District of Gunungkidul. Rice seed was used Sidenuk and Inpari 42 varieties then planted at distance of 40 cm x 20 x 12.5 cm (Tajarwo 2:1). The corn seed used Pioneer 35 and they are planted at 60 cm x 25 cm. The purpose of this research is to examine the application of intercropping rice-corn compared to monoculture cultivation on the aspects of soil nutrients status, affects intercropping on both crops yield and feassibility analisys of the intercropping farming on the two different agricultural system. The results of study show that on intercropping pattern rice yield can reach 5.19 to 5.85 ton ha-1 and dry corn shells from 5.43 to 6.28 tons ha-1 and quite profitable with a B/C ratio of 2.68 and R/C ratio of 3.12 compared to rice or corn monoculture planting patterns alone with B/C ratios of 1.24 and 1.88, respectively

<em>Rice</em><em> </em><em>cultivation</em><em> in the second growing season in dry land at Gunungkidul Special Region of Yogyakarta requires additional irrigation and improvement of physical, chemical and biological soil properties. This study aimed to determine the role of organic fertilizer ameliorant on rice yields during second growing season in dry land. The research was conducted in Sambirejo Watusigar Ngawen Gunungkidul Special Region of Yogyakarta during second growing season from March to July 2019. The study used a Randomized Completely Block Design (RCBD) with 3 treatments in the form of no ameliorant, ameliorant of 2 tons ha^-1 and ameliorant 4 tons ha^-1, with 5 replications. The results showed that the use of ameliorant 2 tons ha^-1 produced rice 5.64 ton ha^-1 and ameliorant 4 tons ha^-1 produced rice 6.04 ton ha^-1, which was significantly higher than without ameliorant which only produced 5.29 ton ha^-1 of rice.</em>