Prihastuti Prihastuti
Balai Penelitian Tanaman Kacang-Kacangan dan Umbi-Umbian

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KARAKTERISTIK GAMBUT RAWA PENING DAN POTENSINYA SEBAGAI BAHAN PEMBAWA MIKROBA Prihastuti Prihastuti
BERITA BIOLOGI Vol 12, No 3 (2013)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v12i3.640

Abstract

This is a descriptive analytical research to describe characteristic of peat soils of Rawa Pening (a natural lake in Central Java, Indonesia). The purpose of this study was to determine the potency of peat soils as a microbial carrier. The parameters observed were chemical properties (pH, levels of C, N, P, K and CEC) and biological properties (total of soil microbial population), as well as its amendments by sun drying,ovens drying and sterilization process by autoclaving (121oC, and 1.5 atm for 15 minutes). The results showed that the Rawa Pening peat soil content consisted of high organic C, medium-high N, low-medium P, high K and high CEC. Total of soil microbial population was quite high, but it was reduced by sun drying and autoclave sterilization. The population of soil microbial was pressured by oven drying, but the process makes it a low pH caused by cell lysis. The Rawa Pening peat soils had physical properties that were not easily changed, is also not prone to changes in pH during the process by sun drying and sterilization by autoclave. It was concluded that the Rawa Pening peat soils have a potential to be a microbial carrier, since it contained high organic matter, and relatively easy to process.
Aplikasi Pupuk Hayati Illetrisoy pada Tanaman Kedelai dan Pengaruhnya terhadap Populasi Mikroba Tanah Prihastuti Prihastuti
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Illetrisoy is a biological fertilizer for soybeans, improvised by Indonesian Legume and Tuber Crops Research Institute, consisting in two forms of formulations A and B. This study aimed to determine the benefits of Illetrisoy bio-fertilizer application on growth and seed yield, as well as its effect on soil microbial populations.� � � � � � � � � � The research was conducted at the Indonesian Legume and Tuber Crops Research Institute, using of biological fertilizers Illetrisoy and soybean Grobogan variety. Design of the experiment used was a factorial randomized block with six replications. The first factor was the manure application consists of (1) without any manure, and (2) given manure. The second factor is giving inoculant Illetrisoy, consisting of (1) without inoculant, given inorganic fertilizer P, K, (2) without inoculant, given inorganic fertilizer N, P and K, (3) inoculation Illetrisoy A, and (4) inoculation Illetrisoy B. The results showed that the application of bio-fertilizers Illetrisoy on soybean has not significant effect on the physical variability of plants 45 days after planting and seed yield, compared to the treatment of manure and NPK application. The highest seed yields achieved on the application of Illetrisoy B accompanied with the application of manure and NPK fertilizer reached 50% (19.20 g seed/plant), which is not significantly different from the standard cultivation with application of NPK fertilizers which reached 18.43 g seed / plant. The analysis of the soil before and after soybeans planted, showed an improvement of chemically and biologically soil properties in terms of nutrient content (especially N and K) and total soil microbial population up to a hundred times.
Kajian Penggunaan Pupuk Hayati Kemasan untuk Tanaman Kacang Tanah di Lahan Kering Masam, Lampung Prihastuti Prihastuti; Purwantoro Purwantoro
Sains dan Matematika Vol. 3 No. 1 (2014): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Penggunaan pupuk hayati merupakan suatu pilihan untuk dilakukan dalam upaya meningkatkan penyediaan unsur hara tanaman, terutama yang ditanam pada lahan-lahan marjinal. Tujuan penelitian ini untuk mendeskripsikan pengaruh penggunaan pupuk hayati kemasan untuk tanaman kacang tanah. Penelitian menggunakan rancangan acak kelompok dengan enam jenis pupuk hayati yang diberikan secara tunggal ataupun kombinasi, masing-masing dengan tiga ulangan. Parameter yang diamati adalah tinggi tanaman, hasil polong, dan jumlah polong. Analisis kimia tanah sebelum tanam meliputi pH, C-organik, N, P, K, Ca, Mg, Al-dd, H-dd. Parameter biologis yang diamati adalah jumlah bintil akar dan tingkat infeksi mikoriza pada akar, dengan jumlah sampel tiga tanaman untuk masing-masing ulangan. Analisis data menggunakan analisis varians dilanjutkan dengan uji beda nyata terkecil (BNT). Hasil penelitian menunjukkan bahwa mikrob yang diintroduksikan melalui pupuk hayati kurang dapat berkembang dengan baik, yang diikuti dengan pertumbuhan tanaman yang kurang baik pula. Ketersediaan air merupakan faktor pembatas bagi perkembangan mikrob dan tanaman sehingga pertanian di lahan kering perlu disesuaikan dengan musim. Rendahnya pH tanah menghambat pertumbuhan bakteri pembentuk bintil akar. Penggunaan pupuk hayati yang tidak sesuai dengan kondisi lapang, sekalipun tanaman kacang tanah mampu membentuk polong, namun tidak mampu membentuk biji. Pupuk hayati yang direkomendasikan untuk digunakan di lahan kering masam adalah yang mengandung bakteri pelarut fosfat dan mikoriza vesikular arbuskular. The use of bio-fertilizers is an option to conduct in the effort improving the supply of plant nutrients, especially those planted on marginal lands. The aim this study was to determine the effect of the use of commercial biological fertilizers for peanut at acid dry land. This research used a randomized complete block design with six types of commercial biological fertilizers given in single use or in combination, each was applied in three replications. Parameters measured were plant height, pod yield, and the number of pods. Chemical analysis of the soil before planting include pH, C-organic, N, P, K, Ca, Mg, Al-dd, H-dd. Biological parameters measured were the number of nodule and level of the mycorrhizal root infection, the number of samples were three plants for each replication. Data were analyzed using analysis of variance (ANOVA) and followed by least signifi cant difference test (LSD). Results showed that the microbes that were introduced through bio-fertilizers were less well developed, followed by the growth of plants that were less good anyway. Water availability was a limiting factor for the development of microbes and plants, hence agriculture in dry land needs to be adjusted with the seasons. The low acidity of the soil inhibited the growth of nodule-forming bacteria. The use of biological fertilizer was not correspond to field conditions, even though peanut plants are capable of forming pods, however they are not capable to form a seed. Biological fertilizer that are recommended for usage on acid dry land is contained phosphate solubilizing bacteria and vesicular arbuscular mycorrhizae.