The fertilization management is one strategy to optimize the quantity and quality of rice production. Our study was aimedto investigate the effect of potassium fertilization several agronomical parameters andthe rate of head rice after milling process. The study was conducted from March 2018 to July 2018 in the Agrotechnopark experimental field University of Jember in District of Sukorambi, Jember. Randomized Block Design (RBD) was used with the frequency of potassium chlorice (KCl) fertilization asthe single factor. The conducted potassium treatments were as follows: without KCl fertilization (control), one-time KCl fertilization, two times KCl fertilization, three times KCl fertilization and each fertilization level was conducted by sixrepetitions. The agronomic parameters such as plant height, tiller number, flowering time, rate of productive tillers, grain number per panicle, weight of 1000 grains, and percentage of filled grain were analyzed and percentage of head rice rate was determined as quality parameter. Our results showed that different treatment of potassium did not significantly affect the plant height, tillernumber, flowering time, rate of productive tillers, total grains per panicle, and weight of 1000 grains. On the other hands, the percentage of filled grainand the rate of head rice after milling were significantly increased by potassium fertilization. Compare to the control treatment, three times potassium fertilization resulted 9.24% and 13.83% increase of filled grain and head rice after two times milling, respectively. Our result suggest that potassium fertilization is important for grainquality of Merah Wangi rice variety. Keywords: Merah Wangi, potassium fertilization, growth, physical quality.

Purpose : Mycorrhizae are mutualistic symbiosis or association between soil fungi and plant roots which plays an important role in increasing nutrient availability and crop productivity. Potatoes are one of the carbohydrate-producing plants and it can be propagated with mini cuttings from plantlets. The application of mycorrhizal inoculant is expected to increase the yield of potato from mini cuttings. The research was conducted to investigate the effect of mycorrhizal inoculants on degree of root colonization, growth and yield seed of Granola L potato propagated with mini cuttings. The study aimed to increase potatoes seed productivity by application of mycorrhizal inoculant. Research Method : The experiment used was Randomized Block Design consist of six treatments (0, 5 g, 10 g, 15 g, 20 g, and 25 g per plant), and repeated 4 times. The observed responses were degree of roots infection, plant height, leaf number, plant dry weight, the number of tubers and tuber yield. Findings : The results showed that the application of mycorrhizal inoculants was able to increase root colonization by 344% and plant dry weight by 47.49%. Application of 15 g/plant mycorrhizal inoculants increased the plant height at 6 and 8 week after planting by 23.92%, 16.24%, respectively and tuber yield per plant by 24.96%. These results confirm that the application of 15 g per plant mycorrhizal inoculants can be used to enhance the productivity of potato seeds. Limitations : Mycorrhizal colonization was highly affected by the soil physico-chemical properties, the active ingredients and quality of inoculants. Value : This research contribute to increase seed production of potato.

Plants activate the unfolded protein response as part of cellular adaptation, thereby maintaining the endoplasmic reticulum homeostasis during external stresses exposure. In this study, we examined the relationship between the degree of salt tolerance and unfolded protein response-related gene expression in India salt-tolerant Pokkali and INPARI 35 varieties compared to the Indica salt-sensitive counterpart IR64 and INPARI 4 varieties.  Our result showed that the salt tolerance of Pokkali and INPARI 35 had been confirmed by their higher survival rate, higher chlorophyll content, lower electrolyte leakage, and lower H2O2 and malondialdehyde content under salt stress conditions. Furthermore, the expression of unfolded protein response genes was highest in INPARI 35, whereas IR64 and INPARI 4 exhibited low gene induction during endoplasmic reticulum stress conditions. Among the four examined varieties the salt tolerant Pokkali surprisingly showed the lowest induction of all examined unfolded protein response-related genes. These results indicated the possibility that unfolded protein response supports the rice plant for adapting to the saline environment.