Management practices, soil properties and productivity in ecologically-intensified rice-based cropping systems

Date

5-2015

Abstract

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 on non-puddled soils with overhead sprinkler irrigation. In the rice-rice system on puddled 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 (Ksa), 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 Ksat 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`l) than maize-rice-rice (11.9 Mg ha') and rice-rice (10.1 Mg hal). 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.

Document Type

Dissertation

Degree

Doctor of Philosophy in Soil Science

Adviser/Committee Chair

Dr. Pearl B. Sanchez

Co-adviser

Dr. Roland J. Buresh

Committee Member

Rodrigo B. Badayos, Pompe C. Sta. Cruz

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 2015 S72 O77

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