Study of Several Relationship of Fertility Parameters on Rice Production of Ciherang Variety on Regosol Soils in The Southern Slopes of Merapi, Yogyakarta, Indonesia
Keywords:Merapi, soil fertility, crop production, linear regression, regosol soil
AbstractOne of the volcanoes known as the most active mountain in the world is Mount Merapi. The impact of the Merapi eruption can lead to the addition of volcanic material whose deposits can fertilize the soil. This study aims to determine the relationship of several fertility parameters to the production of Ciherang variety on regosol soil in the Southern Slopes of Merapi, Yogyakarta, Indonesia. Observations were made by taking soil fertility samples as many as 37 demonstration plots using the stratified purposive sampling method. Statistical data from the relationship between fertility parameters on rice production were processed using simple linear regression. From this simple linear regression, we can find parameters that have a significant effect and non-significant effects on rice production and also information on fertility parameters in the form available in the soil with a greater effect than those in the total form. The results showed that phosphorus in the total form has a value of R2 = 0.3229 to DGH, whereas phosphorus in the available form (Bray 1) has a value of R2 = 0.7142 to plant production (DGH). Potassium in the total form has a value of R2 = 0.1124 to GKP, while the potassium in the form available (Morgan K2O) has a value of R2 = 0.3233 to DGH. Cation Exchange Capacity (CEC) and Base Saturation (BS) each have a value of 0.3651 and 0.5758 for plant production (DGH). C-org and Si each have R2 = 0.4639 and 0.324 values for crop production (DGH). R2 values close to 0.5 in the cross-section data can be said to be high.
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