Sains Tanah - Journal of Soil Science and Agroclimatology

1-8

Authors: Subagiya Subagiya

The research on Rice Pest Control with Soil Biological Agents Solenopsis geminata (F) has been implemented in the Karanganyar Region consists four districts. The districts are Karanganyar, Jumantono, Karangpandan, and Tasikmadu. The research was conducted by survey methods and field experiments. The study was conducted on paddy field with an average daily temperature of 32 ° C, and at 150 -350 m altitude above sea level. The main objective of this study was to determine the distribution and diversity of insects in the paddy field in Karanganyar. The locations were district of Jumantono, Karangpandan, and Tasikmadu. The results showed that the insect was in the vegetative phase in rice planting Karangpandan had 13 kinds of insects with the diversity index of Shannon-Weaner was 1.63, while for the district that the highest of diversity index value was Tasikmadu district by 2, 33 with the number of insects was 14. In the paddy field at generative phase, the lowest of index diversity was Karanganyar by 2,01; while the highest was in district of Karangpandan at 2,19.

19-26

Authors: Sudadi Sudadi, Ika Ernawati, Sumarno Sumarno, Widyatmani Sih Dewi, Hery Widijanto

The problem of nutrient deficiences tend to increase, including sulfur deficiency. The use of high purity NPK fertilizers stimulate sulfur deficiency in agricultural land. This problem can be corrected by the use of elemental sulfur accompanied with S-oxidizing biofertilizer. The study aimed to evaluate the potential of sulfur oxidizing microbial isolated from Andisols of Dieng Central Java as S-oxidizing inoculant. Andisols Dieng naturally contains high sulfur that allegedly inhabited many sulfur-oxidizing microbials. The research consisted of two experiments, each arranged in completely randomized design (CRD). Each experiment consist of two factors namely the kind of microbial isolated from Andisols Dieng and incubation time. The first experiment used Czapek-dox+elemental sulfur medium, while the second experiment used vermicompost as medium. The observed variables include soluble-S, bacterial density, biomass of fungi and medium pH. One isolate of bacteria (I1)and three isolates of fungi (F1, F2 and F3) taken from Andisol of Dieng showing their ability to oxidize sulfur in Czapek-dok agar medium. They were used as isolates in the experiment. The result of the first experiment showed that the oxidized sulfur increased with the length of incubation time as indicated by the increase of soluble-S, bacterial cell density or fungi biomass in the medium followed by the decrease of pH. The second experiment showed that the population of bacteria or fungi isolates and soluble-S of vermicompost were increased collaterally with incubation time. The fungi isolate of F2 have the highest potency as inoculant of S-oxidizing biofertilizer as shown by it ability to survive, grows and oxidize S both in Czapek-dox+elemental sulfur liquid medium as well as in vermicompost medium.

37-44

Authors: Setie Harieni, S Minardi

The purposes of this study were to determine the effect of organic fertilizer residues and addition of urea fertilizers in improving soil fertility in the C excavation paddy soil and the yield of corn (Zea mays, L). Research was conducted by using completely randomized design (CRD) single factor, consisting of six treatments, as follows, P0: Control, residue treatment of : inorganic fertilizer (P1), Cow manure (P2), Bokhasi fertilizer (P3), manure and inorganic fertilizer (P4), Bokhasi and inorganic fertilizer (P5). Urea fertilizer was added a quarter of recommended dose for each treatment residue. It was given twice, except for the control treatment, and repeated 4 times, and placed randomly. Observations of soil chemical properties comprising: soil pH, C-organic, BS, CEC and the N-total crop land, while parameters of the plants, including components of the growth and yield of corn, were also observed. The results showed that the residue of organic fertilizer and the addition of urea fertilizer were able to increase the fertility of the C-excavation paddy soil. It has been proved by the growth and yield of corn were increased, such as plant height, fresh and dry weight of plant, weight and girth of the highest cob. Residual treatment obtained from the treatment of organic and inorganic fertilizer showed significantly different with the addition of urea fertilizer, as compared to control, however it showed not significantly different to other treatments.

55-70

Authors: Melulosa Andhytya Sakti, Bambang Hendro Sunarminto, Azwar Maas, Didik Indradewa, Bambang Djadmo Kertonegoro

Implementation of Act 41 of 2009 on sustainable agricultural land still needs to be improved. Purworejo has a total area of 103,481.75 hectares consisting of rice, dry land and mixed garden. Increased development of a high enough lead Purworejo prone land conversion primarily agricultural to non-agricultural land. Determination of sustainable agricultural land is expected to control the pace of the transfer function. This study aims to determine the parameters for mapping LP2B and LCP2B, determine the basis for assessing inter-parameter calculation and LCP2B LP2B, determine the characteristics of the grouping criteria as LP2B agricultural land and agricultural land mapping LCP2B and sustainable food (LP2B) Purworejo. The data used in this study include spatial data and spatial data tabulated data consists of the Present landuse map the results of high-resolution satellite image interpretation purworejo district scale 1:25,000, topographic maps, maps of land suitability, administration district map boundaries, and maps of raw paddy fields. Tabulation of data consists of the need and availability of food, food balance, wetland conversion, the rate of population growth, and land area requirements. The survey results revealed that the total population, wetland production, planted area, harvested area, conversion rate and balance of food can be used as a parameter to specify the grouping criteria LP2B while land based on the irrigation system and the productivity of more than 5.5 tonnes / ha with IP is more than 1.75. Based on the analysis Purworedjo county has a total area of 38,562 ha area of agri-food consisting of 27,850.18 ha of wetlands and 10,712 ha of dry land. Of the area that became wet LP2B area of 25,826 ha and 5,243 ha of dry LP2B. Sustainable food agriculture land reserve wet (wet LCP2B) 2,024 ha and sustainable agri-food reserves dry (dry LCP2B) 5,469 ha.