SSRG International Journal of Agriculture & Environmental Science (SSRG-IJAES) – Volume 7 Issue 5 – Sep – Oct 2020 ISSN: 2394 - 2568 http://www.internationaljournalssrg.org Page 43 Utilization of hush ash on growth and yield of soybean (glycine max l.) No-tillage cultivation Supriyono 2 , Jauhar Kumala Shuni 1 , Maria Theresia Sri Budiastuti 3 , Sri Nyoto 4 1 Undergraduate Agrotechnology Study Program, Faculty of Agriculture, UNS Surakarta 2, 4 Lecturer of Agrotechnology Study Program, Faculty of Agriculture, UNS Surakarta ABSTRACT Soybean ( Glycine max L.) is an annual plant that contains lots of protein and is rich in benefits. Soybean is one of the essential food crops after rice and corn. Soybean production has decreased from year to year due to reduced soybean planting land, substantial capital, and regulation of soybean prices in an unstable market. Cultivation technology needs to be developed through the availability of local resources and soil structure protection by utilizing husk ash as a source of organic material with no- tillage cultivation. The study was conducted in Pengkok Village, Sragen Regency in June-September 2019, in the form of a field trial using Completely Randomized Block Design (RCBD), one factor of husk ash dose with 5 levels and 5 replications so that 25 unit experiments were obtained. The observed variables were plant height, number of leaves, root shoot ratio, leaf area index, number of pods per plant, number of seed per pod, the weight of seeds per plant, the value of 100 seeds, and dry weight of a straw. The results showed that applying 2.5 tons/ha of husk ash can increase the leaf area index in the growth component. An increase in yield of seeds per plot due to husk ash 1.25 tons/ha. The application 1.25 tons/ha of husk ash is recommended to farmers to increase yield per hectare of soybeans in the amount of 0,73 ton/Ha. Keywords: LAI, husk ash, Seed Weight per plot INTRODUCTION Soybean ( Glycine max L.) is an annual plant that contains a lot of protein. Soybean is one of the essential food crops in Indonesia after rice and corn. Soybeans have various uses, especially as a raw material for the food industry rich in vegetable protein. Soybean is a vegetable protein source with 39% content, where 2% of all Indonesian people get a source of protein from soybeans [1]. Indonesian soybean productivity decreased by 3,95% in 2016 from 15,68 q/Ha to 14,90 q/Ha and decreased by 4,62% in 2018 from 15,14 q/Ha to 14,44 q/Ha. The decrease of soybean production could not suffice the needs of soybeans in Indonesia; the cause is the lack of land use or agricultural land intensification for soybeans. One of the efforts to cultivate soybeans on the former rice cultivation land with no-tillage cultivation is to cultivate soybeans. The activity is intended to optimize land use so that it is productive. Efforts that can be made are implementing a conservation tillage system (CTS), an agricultural land utilization activity that considers long-term social and farming aspects. Conservation tillage is divided into two types, namely minimum tillage cultivation and no-tillage cultivation. No-tillage cultivation has several advantages, such as saving costs, accelerating planting, reducing labor, and preventing soil erosion so that nutrients in the soil are not easily lost [2]. The use of ash on untreated rice fields will help the soil provide nutrients that plants can utilize. Unplanned rice planted land contains several elements, such as N, P, K, and Mg. However, due to the soil's acidic nature, these elements cannot be utilized by plants because they are still absorbed in the soil. To free the elements, these elements are needed organic material that can release the absorbed elements. Husk ash plays a role in increasing the availability of P, K, Si, and Carbon nutrients in the soil [3]. This study aims to study the role of rice husk ash on soybean growth and yield. MATERIAL AND METHOD This research was conducted in June - September 2019 in Pengkok Village, Kedawung District, Sragen Regency, Ecology and Plant Production Management Laboratory, and Soil Chemical Laboratory, Faculty of Agriculture, Sebelas Maret University, Surakarta. The research location is located at -7 o 28 '49 "and 110 o 59' 51" with a height of 153.8 meters above sea level. This research was conducted at the end of the rainy season. The average air temperature ranged from 37- 40 o C. Soil analysis was categorized based on the Soil Research Institute 2009. The analysis results showed a soil pH of 6.74 (neutral) with N and P content low, at 0.16% and 7.58 ppm. The K content of 0.23me% is classified as low. Organic C value of 1.14% (low) and C / N value of 7.12 (very low). This study used a Completed Randomized Block Design (RCBD) consisting of one factor with 5 levels and was repeated 5 times, so that 25 experimental plots were obtained. The factors used are the husk ash dose consisting of B0 (control / 0 tons / Ha), B1 (1.25 tons / Ha), B2 (2.5 tons / Ha), B3 (3.75 tons / Ha), and B4 (5 tons / ha). The size of the trial plot is 1,2 m x 1,8 m. Variables observed were plant height,