'Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung'
Abstract
Effects of Bio-phosphate on Increasing the Phosphorus Availability, the Growth and the Yield of Lowland Rice
in Ultisol (Yafizham and M Abubakar): Ultisol soil is low of macro and micro nutrient, pH and base saturation as
well as high toxicity of Al and Fe. To increase productivity of ultisols soils, especially availability of P nutrients, the
use of bio-phosphate can increase P solubilizing in the soils. The research was conducted in the green house of
Agriculture Faculty, the University of Lampung from January to March 2005. A factorial experiment using two
factors in a randomized completely block design with five replications was conducted. The first factor was dosages
of bio-phosphate (0; 10; 20 g L-1), the second factor was lowland rice cultivar (Ciherang, Sintanur, Cilosari and IR64).
The results showed that the availability of N, K and P nutrients in the soil before planting was low. Application of biophosphate
increased availability of N, K and P in the soil. Application of 10 g L-1 and 20 g L-1 of bio-phosphate
increased root length of lowland rice, there were 13.3% and 36.8%, respectively. Application of 20 g L-1 of biophosphate
increased 100 grain weight of lowland rice which were higher 11.4% compared to without any bio-phosphate
