| Abstrak/Abstract |
Rice production in Poso district on the average is only 4.24 t ha-1, much lower than the national production (5.15 t
ha-1) caused by a high iron (Fe) content (11.6-22.6 g kg-1) and low soil fertility. Lands with poor drainage will accumulate
organic matter, causing very reductive conditions, i.e highly reduced iron occurs and is toxic for rice crops. The application
of compost and dolomite with intermittent irrigation is expected to reduce the negative effects of the excessive amount of
Fe and increase the P uptake and yield of rice. The experiment that used 5 t ha-1 compost(rice straw and cocoa husks) and
dolomite with different water management has been conducted consisting of control(A0), agrochemical fertilizer
application and intermittent irrigation (A1), 25% straw compost +75% cocoa husks with saturated water irrigation (A2),
100% straw compost with intermittent irrigation ( A3), A2 + 60 kg P2O5 ha-1 (A4), A3 + 60 kg P2O5 ha-1 (A5), and
dolomite with intermittent irrigation (A6), repeatedthree times and set based on randomized complete block design
(RCBD).The results showed that the treatments have no significant effects on available P, organic Fe and available Fe, but
they have significant effects on P and the Fe uptake, the weight of 1000 grains and yield of paddy field. The effects of
composting significantly increase both levels and P uptake of plant, decrease Felevels of plants and increase the P uptake
of plants, the weight of 1000 grains and grain yield. The application of 100% straw compost (5 t ha-1) with intermittent
irrigation produces the highest grain yield (6.44 t ha-1) which is significantly different from those without composting. |
