Selection of potato varieties (Solanum tuberosum L.) in midlands and the effect of using biological agents

Abstract

The study is aimed to produce a potato variety that suits with potato cultivation in midlands as well as to know the effect of using biological agents. The research was conducted from March to July 2015, in Bumiaji and Poncokusumo, two districts in Indonesia. The research was carried out by using Split Plot Design (SPD) consisting of ten treatments and three replications. The treatment was twofold: without and with biological agents (Trichoderma viride, Pseudomonas fluorescents, Streptomyces sp.). Varieties as the subplots are Granola Lembang, Granola Kembang, Desiree, DTO 28, and Nadiya. The results showed that the five different varieties of potatoes with the provision of biological agents showed different responses to the growth parameters and a decline against Phytophthora infenstan and Ralstonia solanacearum diseases. Nadiya variety treated with biological agents indicates the best growth and the best production in midlands of 18.85 tons/ha-1 in Poncokusumo and 18.80 tons/ha-1 in Bumiaji.

Utilization of Plant Growth Promoting Rhizobacteria (Pgpr) in Disease Control Important in Plants Onion (Allium Ascalonicum L.)

“…Giving PGPR directly into the soil allegedly capable Pendergrass organic matter in the soil at the same time the organic material becomes food for microorganisms to reproduce themselves. Lehar et al, (2016) state that plants treated with PGPR which there are biological agents T.viride, P.fluorescens, and Streptomyces sp, is able to decompose lignin, cellulose, and kithin of organic materials into food and provide nutrients are ready to be absorbed by plants. The organic material by microorganisms able to reproduce itself in accordance with the conditions of the organic material.…”

Application of organic fertilizer and Pseudomonas fluorescens on the growth and yield of shallot cultivar Sabu Raijua (Allium ascalonicum L .) in dry land

“…Giving microorganisms directly into the soil is thought to be able to integrate organic matter in the soil as well as these organic materials into food for microorganisms to reproduce themselves. Lehar et al (2016) stated that plants that are given a combination of biological agents in which there are Trichoderma, Pseudomonas fluorescens, and Streptomyces sp, are able to decompose lignin, cellulose, and kithin from organic matter into their food and provide nutrients that are ready to be absorbed by plants. Organic material fed with microorganisms is able to reproduce itself according to the conditions of the organic material.…”

“…Organic fertilizers and biological agents as decomposers will be able to provide balanced nutrients for plants.. Nurman et al, (2017) stated that the balance of nutrients, especially in the soil, plays a very important role in the synthesis of carbohydrates and proteins so it is very helpful in enlarging tubers. Lehar et al, (2016) added that a plant will grow well, if nutrients are needed Enough is available in a form that is easily absorbed by plant roots. This is reinforced by Lehar et al, (2017) which states that the function of vegetative organs such as plant leaves is the main organ in photosynthesis where the wider the leaves, the higher the sun's capture and fixation of CO2, so that large photosynthesis will affect large assimilate yields.…”

“…The high number of leaves with suitable spacing allows optimal absorption of sunlight and results in photosynthesis to produce larger photosynthate. Lehar et al, 2017 said that, a greater production of photosynthate allows the formation of all plant organs such as roots, stems, leaves and tubers in greater numbers.Provision of biological agents functions as a decomposer of organic matter and biological agents capable of stimulating the growth of plant root systems and inhibiting harmful bacterial fungi Lehar (2016). and Rosyida et al, (2013) stated that the provision of organic matter which was decomposed by the biological agent Tricoderma viride and combined with Pseudomonas fluorescens and Streptomyces sp, was also able to increase plant height, leaf number and number of tillers.Ningrum et al (2017) and Soesanto et al,(2014) suggest that giving biological agents to plants can replace chemical fertilizers, pesticides and hormones that can be used in plant growth so as to increase plant height, root length and crop yield.…”

PEMANFAATAN PLANT GROWTH PROMOTING RHIZOBACTERIA (PGPR) DALAM MENINGKATAKAN POLA PERTUMBUHAN BAWANG MERAH LOKAL (Allium ascalonicum L) SABU RAIJUA NTT

“…Naphtoquinone dikenal sebagai antimikroba, antifungal, antivirial dan antiparasitik. Selain itu, naphtoquinone memiliki bioaktivitas sebagai anti kanker dan antioksidan yang biasanya terdapat di dalam sel vakuola dalam bentuk glikosida (Babula et al, 2005;Robinson, 1995 (Lehar dkk., 2018;Lehar et al, 2016;dan Rosyida et al, 2013). Ningrum et al, (2017) et al, (2013).…”