Agro Bali: Agricultural Journal

9

Authors: Made Suarsana, Putu Sri Wahyuni, Made Maliastra

. The purpose of this study was to determine the effect of administering a liquid organic fertilizer / POC dose, the most appropriate dose of nitrogen fertilizer, and its interactions on the growth and production of sweet corn. This research was conducted in September-November 2018 in Telaga Village, Busungbiu District, Buleleng Regency with a height of ± 500 meters above sea level. The design used was a Factorial Randomized Block Design (RCBD) with two factors. The first factor: giving POC Plus (yellow Pomi) with three levels, namely without POC, Giving POC dose of 25 l / ha, and POC dose of 50 l / ha. The second factor is the provision of nitrogen fertilizer with three levels, namely without administering nitrogen, administering nitrogen as much as 69 kg / ha, 138 kg / ha, and 207 kg / ha. Provision of POC has a very significant effect on fresh yields of cob / ha. The use of POC at a dose of 25 l / ha gives the highest yield of fresh cob / ha, which is 27.83 tons. Regression analysis results of the relationship between the dose of POC (x) with fresh yields of cobs per hectare (ŷ) showed a quadratic relationship, namely ŷ = 24.25 + 0.28x - 0.006x2 with R2 = 89.80%. The provision of nitrogen has a very significant effect on the yield of fresh cobs per hectare. Giving nitrogen at a dose of 138 kg / ha gave the highest yield of fresh cobs per hectare, ie 28.30 tons. Regression analysis results of the relationship between the dose of nitrogen (x) with the results of cobs per hectare (ŷ) showed a quadratic relationship, namely ŷ = 20,663 + 0.0087x - 0,0003x2 with R2 = 88.28%. The interaction between administration of POC and nitrogen significantly affected the fresh yield of cob / ha. The use of a combined POC of 25 l / ha and nitrogen at a dose of 138 kg / ha gave the highest fresh cobs / ha yield, namely 29.61 tons

11

Authors: Putu Shantiawan Prabawa, Jhon Hardy Purba

The use of colchicine chemical mutagens as ingredients to induce polyploidies in plants provides an opportunity for increased production of black rice, which until now has low productivity. This is related to the many benefits of black rice for health, thus causing increased consumer demand. It is hoped that the various doses of colchicine can increase gene doses, so plants have a better appearance and production. The purpose of this study was to identify phenotype changes in the genotype of black rice (Oryza sativa L.) var Cempo Ireng due to the treatment of various doses of colchicine. The study used a single plot design with four colchicine concentration treatments (0, 250, 500 and 750 ppm) on two black rice genotypes (Ungaran and Cempo Ireng). Data analysis used a significant independent t-test level of 5%. The results showed that the treatment of colchicine with a concentration of 750 ppm was effective in inducing mutations that caused phenotypic changes in most plant characters in both genotypes.

12

Authors: Putu Sriwahyuni, Putu Parmila

The progress of biotechnology not only facilitates the process of inoculation and preparation of biological fertilizer formulations but also makes it easier to identify and characterize the types of microorganisms that show high effectiveness as biological fertilizers. Selected collection of microorganisms increases the effectiveness of certain nutrient tethering and facilitates its supply to plants. Making biofertilizers can be done simply by taking soil that has been turned into biofertilizers, for example, legin in peanut plants, then applied to new crop land for planting legumes or with sophisticated technology to identify, isolate certain superior microorganisms and make a formulation a mixture of various types of microorganisms that are able to produce nutrients directly or indirectly for plant growth. Various studies have shown that biological fertilizer is beneficial in improving soil fertility, improving soil health, spurring plant growth and production. However, the use of biological fertilizers by farmers is still far behind compared to non-biological fertilizers. Therefore, research, development, and innovation of biological fertilizer products need to be carried out continuously.