INCREASE RICE PRODUCTIVITY TROUGH MODELS OF CROPPING SYSTEMS AND THE USE OF HYBRID VARIETIES
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This search aims to determine the increase of rice productivity through different models of cropping systems and the use of hybrid seeds. The search was conducted in Sumberharjo Village, Prambanan Subdistrict Sleman Yogyakarta. Specification of field research were irrigated fields, regosol soil type, altitude of 109 m above sea level. The research was conducted on planting season II (March-July 2015). The Reseach methods used completes randomized block design factorial, three kinds of models of cropping system ( Tajarwo, Tegel and Telapak Macan) and two kinds of hybrid rice seeds (Super Jumbo Sanita;V1 and Mapan P-05:V2) That was six Treatment combined. Each of combine treatment repeated four times. Statistical Analysis of Variance with DRMT 5% was used to determinate the effect of treatment to know the real difference between treatments. Observation parameters were plant height, number of productive tiller, wet/dry straw weight of 1000 grains and productivity. The result showed that he treatment of two hybrid rice varieties Mapan P-05 and Super Jumbo, didn’t show significant effect on rice productivity. The treatment of croping systems Tajarwo, Tegel and Telapak Macan had significant effect on productivity. Six palnting systems combinations have significant impact on productivity. The average productivity of dry grain harvested per hectare was 8,7 tons and 8,6 tons for Super jumbo sanita and Mapan P-05. The milled rice per hectar for hybrid varieties was Super Jumbo Sanita 6,8 tons and Mapan P-05 6,65 tons. The average productivity of dry harvested and miled rice per hectare for planting systems treatment were Tajarwo (8,36 tons and 6,95 tons), Tegel (8,5 tons and 6,18 tons) and Telapak Macan (9,07 tons and 7,06 tons) The highest average productivity of dry grain harvested was 9,65 tons per hectare for combination Telapak Macan and Super Jumbo and the lowest was 8,17 tons per hectare for combination Tajarwo dan Super Jumbo. The highest milled rice production per hectare was combination Telapak Macan and Super Jumbo (7,48 tons) and the lowest was Tegel and super jumbo (6,1 tons).