Management practices, soil properties and productivity in ecologically-intensified rice-based cropping systems
2015
Orpiano, R.G.
A study was conducted to determine the spatial variation in soil properties and productivity for three rice-based systems in unreplicated 4-ha plots. The systems included rice-rice on puddled soil with flood irrigation and rice-mungbean-rice and maize-rice-rice puddled soils with overhead spinkler irrigation. In the rice-rice system on puddled soils with overhead spinker irrigation. In the rice-rice system on pulled soil, spatial variation of soil penetration resistance (PR) in the plow layer (0-0.15 m depth) was high. It was positively associated with saturated hydraulic conductivity (K sub sat), negatively correlated with effective depth, and negatively correlated with yield of transplanted rice. In the rice-mungbean-rice system on non-puddled soil, spatial variation of K sub sat was high and negatively correlated to soil water and yield of mungbean and subsequent dry-seeded rice. Soil water holding capacity (WHC) correlated positively with rice yields in the two seasons. Dry-seeded rice on non-puddled soil had less water input, flowered early and yielded higher than rice established by transplanting on puddled soil. Rice-mungbean-rice had higher productivity as measured by rice equivalent yield (15.7 Mg/ha) than maize-rice-rice (11.9 Mg/ha) and rice-rice (10.1 Mg/ha). Low yield with transplanted rice was attributed to insufficient plant population and reflects the need for further refinements in mechanical transplanting to achieve high yield.
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