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Studies on paddy upland rotation at fluvio marine paddy soil 1. effect of subsurface drainage and paddy upland rotation system on soil physico chemical properties and the growth and yield of crops

Yoo, C.H.; Kim, J.G.; Kahng, J.G.; Lee, J.S.; Shin, K.H.; So, J.D.; Park, K.H.

Research Reports of the Rural Development Administration 33(1 SOIL FERT): 14-28

1991


Accession: 007832826

This study was conducted to investigate the influence of paddy-upland rotation cultivation on soil physicochemical properties, plant growth, yield potential and weed community at Jeonbug series with subsurface drainage system for 2 years from 1989 to 1990. The results obtained were summarized as follows: In soil chemical properties at rotation plot, pH, av. SiO2, Ca2+, K+, CEC and T-N were decreased, but the amount of O.M. and Av. P2O5 were increased. In soil physical properties of rotation plot, the soil moisture contents, percentage of solid and liquid phase and bulk density were decreased, but porosity and percentage of air phase were increased. After cultivation of barley, changes of soil chemical properties showed that the amount O.M, T-N, Av. P2O5, K+, Mg2+ were decreased, but Ca and CEC were increased in surface soil at soybean sequential cropping plot. At rice sequential cropping plot, only the amount of Ca2+ was decreased other constituents were similar to the soil properties before the experiment. Soil moisture content, bulk density and percentage of solid phase were largely decreased, but porosity and percentage of air phase were increased at two experiment plot. Soil hardness according to soil depth was lower at rotation plot (rice + soybean) than at rice continuous cropping plot with subsurface drainage condition, and percolation rate were rapid in order of rotation plot } rice continuous cropping plot } rice continuous cropping plot > rice continuous cropping plot with no underdrain condition till 30 days, thereafter showed no significant difference. Emergence ratio of soybean showed 98% and 68% at the condition of field aggregate size less than 10 mm were 81% and 58% respectively, and the formation of rooting zone of rice were good in order of double cropping plot (barley + rice) > rotation plot (soybean + rice) > rice continuous cropping plot } rice continuous cropping plot of no underdrain condition. The ratio of wet soil to dry soil of liquid limit showed dry effect in order of soybean + soybean } soybean + barley + soybean } rice continuous cropping plot > soybean + rice > rice (no underdrain) + soybean rice continuous cropping plot of no underdrain condition, and at the surface soil, plastic limit of dry soil were 22-24%, 27-36% and 23-25% at rice continuous cropping plot of no underdrain condition, rice continuous cropping plot of underdrain condition and soybean + soybean plot respectively. The amount of polished rice were 11% (593Kg/10a) more at underdrain condition than at no underdrain condition of the continuous cropping plot, the amount of soybean were 58% (430Kg/10a) more at growth average plot than growth inferior plot, and the drain yield 17% (477Kg/10a) more at soybean sequential cropping plot than at rice sequential cropping plot. At the second year of paddy-upland rotation experiment, species of weed were 15 and showed in order of soybean + soybean > soybean + barley + soybean > rice (no underdrain) + soybean in dry weed, and species of wet weed which grow largely at levee were 11.

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