Abstract. Akbar MR, Purwoko BS, Dewi IS, Suwarno WB, Sugiyanta, Anshori MF. 2021. Agronomic and yield selection of doubled haploid lines of rainfed lowland rice in advanced yield trials. Biodiversitas 22: 3006-3012. Selection process is important step to obtain high yielding variety. This study aimed to obtain information on agronomic performance of doubled haploid lines of rainfed rice in advanced yield trials and select the best lines for multi-location yield trials. Two experiments were conducted in Bogor and Subang using a randomized complete block design for each location and consisted of 35 doubled haploid lines and two check varieties namely Ciherang and Inpari 18 as a treatment. The result revealed that interaction between genotype and environment (G x E) significantly affected all agronomic characters, except on the panicle length. Characters with high heritability value were all agronomic characters except number of productive tillers and productivity. Genotypic correlation analysis showed that number of productive tillers and weight of 1000 grains had significant and positive correlation with productivity. The selection used weighted selection index based on multivariate analysis. Fourteen lines were selected for multi-location yield trials. These lines had characteristics as follows: number of productive tillers (14.0-17.7 tillers), weight of 1000 grains (24.7-32.5 g), and productivity (5.0-6.2 ton ha-1). The selected lines can be evaluated further to obtain superior lines in multi-location trials.
Nitrogen use efficiency (NUE) is a necessitate in order to enhance sustainable rice farming in Indonesia. Thus, objective of present research was to evaluate NUE of local and national Indonesian superior aromatic rice treated with different levels of nitrogen fertilizer (N). Planting plot was arranged using five levels of N as the main plot, i.e; 0, 45, 90, 135 and 180 kg ha-1; and two rice varieties as subplot, i.e: Sigupai Abdya (local) and Inpari 23 Bantul (national). The results showed application 180 kg N ha-1 to Sigupai Abdya significantly increased the plant height. However, it also postponed the flowering time. Inpari 23 Bantul treated with 180 kg N ha-1 produced the highest number of tillers. Combination of 90 kg N ha-1 with Sigupai Abdya variety significantly reduced the number of empty grains. Sigupai Abdya variety has a higher number of grains per panicle and sampling plot yield than Inpari 23 Bantul, and dosage 90 kg N ha-1 increases grain yield per clump also sampling plot yield significantly. Nitrogen at 180 kg N ha-1 made Sigupai Abdya variety has high N content and absorption N in primordia phase, and the Inpari 23 Bantul variety had grain with high N content. Nitrogen at 90 kg ha-1 caused Sigupai Abdya variety at primordia phase had NUE higher than Inpari 23 Bantul. This study showed that local variety Sigupai Abdya is suitable for development as rice with low input NKeywords: Aceh aromatic, low input, nitrogen dose, N uptake, Oryza sativa L.
Bakteri Bacillus sp. non patogenik memiliki potensi sebagai pupuk hayati. Pupuk hayati di Indonesia sebagian besar terdiri atas konsorsium beberapa macam mikroba. Pupuk hayati yang diuji, "Pupuk X" terdiri atas 10 spesies bakteri Bacillus sp. Penelitian ini bertujuan untuk mengevaluasi efektivitas Pupuk X dalam melarutkan fosfat, memfiksasi N2 dan mensintesis fitohormon Indole-3-Acetic Acid (IAA), serta mengujinya secara in planta pada bibit padi. Kemampuan melarutkan fosfat diuji pada media Pikovskaya padat dengan mengamati munculnya zona bening di sekeliling koloni. Kemampuan memfiksasi N2 secara kualitatif dan kuantitif masing-masing diuji pada media NFB padat dan Acetylene Reduction Assay. Kemampuan sintesis IAA diukur secara kolorimetri pada λ 530 nm, sedangkan pengaruh pupuk hayati cair terhadap bibit tanaman padi diuji secara in planta menggunakan bibit padi varietas IPB3S. Sedikitnya terdapat enam spesies bakteri Bacillus pada pupuk hayati yang digunakan memperlihatkan morfologi koloni berbeda, dengan total populasi mencapai 7,6×10 11 cfu ml-1 dan ukuran sel-sel Bacillus sp. bervariasi antara 2,39-3,01 µm. Pada pupuk hayati ini terdeteksi aktivitas nitrogenase sebesar 0,05685 µm ml-1 jam-1. Konsorsium Bacillus ini dapat melarutkan fosfat dari sumber Ca3(PO4)2 dengan indeks pelarut fosfat 2,6. Fosfat terlarut tersebut disebabkan karena produksi empat jenis asam organik oleh Bacillus sp., yaitu asam asetat, asam oksalat, asam laktat, dan asam malat dengan konsentrasi sekitar 0,01-1,02 mg l-1. Konsentrasi IAA pada pupuk hayati cair terdeteksi sebesar 3,0065 µg ml-1. Inokulasi Pupuk X pada bibit padi dapat meningkatkan jumlah akar lateral 42,8% yang berpotensi meningkatkan serapan hara dalam tanah.
The study aims to describe the characteristics of unemployed workers in Central Java Province and to determine the model of educated unemployment duration. It uses the linear regression model of 1721 workforces that are sampled from National Labor Survey 2015. The model regress the unemployment duration on age, sex, education level, income during unemployment period and GRDP of the industrial, service and agricultural sectors. Findings and Originality: The results show that variables of age, sex, the income of job seekers, education level at junior and senior high school level and GRDP in the agricultural sector have a positive effect on the unemployment duration. The variables of the status of household head, the high school education level, as well as the GRDP service sector, negatively effect the unemployment duration. Thus, it is recommended for the Central Java province government to develop service sectors to shorten the duration of unemployment in Central Java Province.
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