Growth and yield of several Gogo rice varieties (Oryza Sativa L.) applicated by various P sources in Ultisol Planting MediaC

Gogo rice productivity is still low because farmers still use local varieties of Gogo rice and most of it is cultivated on marginal soils such as Ultisol. Ultisol soils contain low available P due to P fixation by Al and Fe. The existence of Gogo rice varieties that can compensate for the high Al content in Ultisol soil and can neutralize Al in plants is one of the right solutions in overcoming the problem of Al poisoning. While the constraint of the lack of availability of P nutrients in Ultisol requires the application of P fertilizer. This study aims to determine the growth and yield of several Gogo rice varieties given various P sources and to determine the best Gogo rice varieties and the best P sources in Ultisol. The research method used a Split Plot Design. The main plot is Gogo rice varieties consisting of three levels, namely; Kuku Balam, Dogor, and Inpago 10, as well as subplots are various sources of P consisting of four levels, namely; No P, 0.4 g TSP, 0.7 g rock phosphate, and 1.8 g guano. The results showed that administration of 0.4 g TSP was the best source of P in Gogo rice than without P, ​​administration of RP, and guano on the value of P nutrient uptake, maximum tillers, productive tillers, flowering age, harvest age, number of grains per panicle, percentage pithy grain, the weight of dry milled grain per clump and the ratio of grain and straw. The Kuku Balam variety had a nutrient uptake value of P (130.91 mg/clump), the number of grains per panicle (210.63 grains) and the weight of milled dry grain per clump (42.11 g) which were the best yields compared to the Dogor and Inpago 10.