Assessment of Climate Vulnerability on Orange Farming System in Batola

The Siamese orange is a superior commodity because it has economic value and is specific to the characteristics of the tidal swamp agroecosystems. Uncertainty triggered by natural conditions and the market causes farmers to lose money, fail to harvest, and suffer, thus affecting the sustainability of their farming business. The final result of the farmer's business describes the magnitude of the Impact felt by the farmer and the farmer's ability to support the losses that can be experienced. This assessment aims to have a comprehensive CVA (Climate Vulnerability Assessment) for the primary commodities in 3 sub-districts in Batola (Carbon, Mandasatana, and Marabahan) and translate the results of activities with recommendations for these various districts. The research was conducted using survey methods, direct observations in the field, Focus Group Discussions, and in-depth interviews with respondents, namely farmers, traders, as well as community leaders and related agencies (Department of Food Crops and Horticulture (DTPH) and District Agricultural Extension Center) totaling 100 people. The DTPH of Batola Regency also collected secondary data. The data collected were analyzed descriptively. In the district of Cerbon (type A), the highest choice is citrus, then seasonal and mixed crops. The major decisions in the Mandastana sub-district (type B) are monoculture oranges, then seasonal crops, diverse crops, and Galam forest plants. In the Marabahan sub-district (type C), apart from citrus, oil palm and rubber have been developed as industrial support plants

Combining ability and heterotic value of ten lines maize genotypes tolerant to tidal-swamp soil stress

Development of maize hybrid for tidal swampland was initiated by selecting and combinate some superior line genotypes that tolerate to the restrictions in target environment. This study aimed was to evaluate the capability of ten maize lines result of selection on tidal swamp acid sulphate soils to obtain GCU, GCA, and heterosis values based on parental yield averages. The experiment has consisted of ten fine line genotypes which have selected in 2019 at the tidal swamp. Each parent was crossed in half-diallel combination, resulting in 46 entries, including the inbred parents. The entries were planted in a randomized complete block design with three replications. The research was conducted on Bajeng Research Station Experiment 5°18’S and 119°30’E from September 2020 to January 2021. The result shows that GCA ability and SCA ability was significant to yield in the form of grain (15% moisture content), the number of ear per plot, ten ear weight, ten corncob weight, ear harvested weight, 1000 seeds weight, plant height, ear length and the number of seed per ear. Grain yield of W6xW9 crosses obtains the highest value of 9.36 tha−1, non-significantly different to hybrid check P35 (9.35 tha-1). The highest GCA value in the grain yield character was obtained on W9 parental line (0.64**). The highest SCA was obtained on the crossing of W7 x W8 (2.61). The highest heterosis value was revealed in W5 x W10 hybrid (4.80). However, W7 x W8 crossing heterosis value was 2.34, indicate that a high SCA effect did not usually generate high heterosis. To perform high heterosis value, W10 was good as female parental.

Performance of six new superior varieties of rice on tidal swamp-land in South Kalimantan Province

Rice is the staple food for millions of people of Indonesia which produced from many agroecology including tidal-swamp. The contribution of swampland to the national rice production is still lower than 2%. One of the indigenous knowledge of the tidal-swamp farmers is the massive use of local varieties which have low yield. Therefore, efforts to increase rice production in tidal-swampland of Barito Kuala Regency should consider the use of superior varieties. The purpose of this study was to find out performance of seven superior varieties in tidal-swamp land in two planting seasons. This research was conducted from March 2020 to March 2021 in Karang Buah Village of Belawang District of Barito Kuala Regency, South Kalimantan Province. The research was arranged in two factors of Randomized Complete Block Design namely varieties and seasons. The first factor consisted of seven varieties: Inpari-42 (V1), Inpari-43 (V2), Inpari IR Nutri Zinc (V3), Inpara-8 (V4), Inpara-9 (V5), Inpara-10 (V6), and IR-42 (V7). The second factor, season consisted of season-1 which started from March to July 2020 and season-2 for planting period from November 2020 to March 2021. The result showed that swamp rice varieties had higher value for plant height variables than those of irrigated rice varieties with Inpari-8 as the highest one. However, all irrigated rice varieties performed better which had higher value for panicle number, filled rice grain, and yield with IR-42 as the highest one. All varieties except IR-42 showed higher values of filled grain numbers when cultivated in season-1 supported by good weather during the study.

Diversity and abundance of arbuscular fungi mycorrhizal (AMF) in rhizosphere Zea mays in tidal swamp

Sefrila M, Ghulamahdi M, Purwono Melati M, Mansur I. 2021. Diversity and abundance of arbuscular fungi mycorrhizal (AMF) in rhizosphere Zea mays in tidal swamp. Biodiversitas 22: 5071-5076. This study aims to find out the diversity and dominance of AMF spores and look at the morphology of fungi mycorrhizal arbuscular fungi that exist in the rooting area of corn (Zea mays L.) crops in the tidal swamp. The study was conducted in September 2020. Soil sampling at the tidal swamp village of Mulyasari Tanjung Lago District, Banyuasin, South Sumatra, Indonesia randomly sampling the corn root zone method. The research stages are soil sampling, soil chemistry analysis, AMF isolation and trapping, and morphological identification of AMF spores. The results showed the number of spores found in soil samples in the corn crop rhizosphere before trapping was less when compared to after trapping. The spores' shape is round, oblong, and oval, with colors ranging from clear, yellow, to brown. AMF spores found come from 2 genera namely (Acaulospora scrobiculata, A. bireticulata, A. mellea, A. laevis) and Glomus (Glomus monosporum, G. constrictum, G. manihotis).

Optimization of Newly Opened Rice Fields on Tidal Swamp Through Superior Rice Varieties in Bulungan District

Indonesian swamp has a high potency to provide areas for agricultural expansion, which means to raise food security. To optimize its utilization, government has developed new rice fields in the tidal swamp. This research was carried out in a new rice field from the tidal swamp in Bulungan District. The research aimed to optimize the new rice fields by implementing superior rice varieties (NSV). The study used a randomized block design (RBD) with three replicates. Benefit Cost Ratio (BCR) analysis was performed to determine the feasibility of rice farming in the new field. The NSV consisted of six varieties of rice, namely Inpara-1, Inpara-2, Inpara-3, Inpara-4, Inpara-5, and a local variety. The planting pattern implemented was jajar legowo (jarwo) 2:1, and seedlings were planted three stems per clump at the age of 20-25 days. Each planting treatment was given the same dose of limestone and fertilizer, namely dolomite 1,000 kg ha-1, NPK fertilizer 250 kg ha-1, and Urea 100 kg ha-1. The results showed that all varieties were able to adapt tidal swamp condition, and Inpara varieties productivity was higher than that of local variety. The productivity of superior varieties rice in a newly opened rice reached 2.6–5.75 tons milled dry grain ha-1. The findings also revealed that superior rice varieties have BCR>1, while the local variety had BCR<1. The productivity of Inpara-1 and Inpara-2 was the highest compared to other varieties and was also feasible to be cultivated on newly opened rice fields in Bulungan District.

Diversity and Composition of Hymenoptera Around Tidal Swamp Rice In Indragiri Hilir District, Indonesia

Pest attacks on rice plants can cause a detrimental decrease in production. Hymenoptera has many important roles in ecosystems, including as parasitoids and predators of pests. The purpose of this study was to determine the presence of Hymenoptera around tidal swamp rice in Indragiri Hilir Regency, Indonesia. Sampling used four traps, namely: 1) swing net; 2) yellow pan trap; 3) malaise trap; and 4) pitfall traps. The analysis was carried out by calculating the Shannon-Wiener diversity index (H'), the Margalef species richness index (D), the Pielou species evenness index (J). Hymenoptera found around tidal swamp rice areas of Indragiri Hilir Regency were 15.253 Hymenoptera insects consisting of 11 superfamilies, 37 families, and 304 morphospecies. Hymenoptera parasitoid had the highest diversity index value (4,80), followed by Hymenoptera pollinator (3,13) and Hymenoptera predator (3,11). The number of species of Hymenoptera parasitoid, pollinator, and predator obtained was 243; 31 and 76 species. The high diversity of Hymenoptera around tidal agricultural land optimizes its ecological role in the rice plantation ecosystem.

Ameliorasi Rizosfer Kedelai Menggunakan Jerami, Abu Sekam, dan Dolomit

Successful saturated soil culture practices in tidal land to increase soybean production needs to be supported by amelioration. The rhizosphere is an area where the intensive reciprocal relationship between plants, soil, and soil microorganisms occured. However, the effect of amelioration through the rhizosphere is still unclear. This research aimed to study the effect of amelioration using rice straw, rice husk ash, and dolomite on the rhizosphere on the growth and production of soybean. The research was conducted in tidal swamp land type B overflow from May to August 2019. The experimental design used was a split-split plot design with rice straw, rice husk ash, and dolomite as the main plot, subplots, and sub subplots, respectively. Rice straw was applied by embedding in the soil, while rice husk ash and dolomite were applied to the rhizosphere during planting. The observations included plant biomass dry weight, leaf nutrient concentration of P, Fe, and Al, number of filled pods, and soybean productivity. The application of rice husk ash with rice straw or with dolomite increased soybean growth and production. The combination of 400 kg ha-1 of rice husk ash and 4 ton ha-1 of rice straw yielded the highest productivity with the value of 2.94 ton ha-1. Keywords: abiotic stresses, rhizosphere, saturated soil culture, tidal land

Species Diversity and Composition of Chalcidids Wasps (Chalcidoidea: Hymenoptera) on Tidal Swamp Rice Field in Indragiri Hilir District, Indonesia

Background: Indragiri Hilir District has the most extensive rice harvest area and is the most significant contributor to rice production in Riau Province. Family Chalcididae is a parasitoid insect that can act as a biological agent to reduce pest attacks on rice. This research aimed to study the species diversity of Chalcididae on tidal swamp rice fields in Indragiri Hilir District. Methods: Sampling was carried out in two periods of rice planting. Samplings were conducted in 4 sub-districts of rice production centers, namely Batang Tuaka, Keritang, Reteh and Tembilahan Hulu, using three sampling techniques (i.e., insect net, malaise trap and yellow pan trap). Diversity index (H’), Species richness index (d), Species Evenness index (J’) and Similarity Index (Is) were calculated. Result: We found 127 individuals consisting of 5 genera and 11 species of Chalcididae were found in the four studied areas. Among them, Antrocephalus lugubris, A. maculipennis, Brachymeria excarinata, B. minuta and Dirhinus anthracia. B. excarinata and Antrocephalus sp. are reported as a new record to Indonesia and were found in all study locations. B. excarinata has the highest abundance of individuals. The shape of the landscape can influence the diversity index, species abundance and individual abundance of Chalcididae.