Results of Upland Rice and Nutrient Uptake in Rainfed Lowland Due to Giving Potassium, Straw Compost and Cow Manure

The purpose of this study was to determine the effect of package Potassium fertilization, straw compost and cow manure on upland rice yield with planting time intervals follow the planting calendar in rainfed lowland at the third planting season. The research design is split plot design with three factors and two replications. The main plot is planting time with three levels, T1: September day 10, T2: September day 20, T3: September day 30. Sub-plots were fertilization package treatment with six levels: K1: without Potassium and compost, K2: 50 kg ha KCl, K3: 5 t ha straw compost, K4: 2.5 t ha straw compost + 2.5 t ha cow manure compost, K5: 50 kg ha KCl + 5 t ha straw compost, K6: 50 kg ha KCl + 2.5 t ha straw compost + 2.5 t ha cow manure compost. Sub-sub-plots were eight rice varieties, V1: Situbagendit, V2: Towuti, V3: Batutegi, V4: Inpago 8, V5: Inpago 9, V6: Inpago 10, V7: Ciherang, V8: Inpari 10. The results showed that interaction of the three treatment factors had a significant effect on grain yield and Phosphorus uptake. The highest grain yield was obtained at planting time in September day 10, fertilizing packages straw compost 5 t ha, Inpago 9 variety (9.24 t ha) and planting time in September day 10 , fertilizing packages KCl 50 kg ha + straw compost 2.5 t ha + cow manure 2.5 t ha, Inpago 9 variety (9.01 t ha).