Year: 1980
Type: article
Abstract: The purpose of this paper was to investigate the effect of mulching by black polyethylene film (0.04mm thick) with planting holes (5.5cm diameter) and by soybean canopy on the microclimate near the row surface.Four experimental plots were designed as follow: No. 1 plot was not planted and not mulched, No. 2 plot was planted and not mulched, No. 3 plot was not planted and mulched, and No. 4 plot was planted and mulched. Medium maturing soybean, named ‘Ohsodefuri’, was used in this experiment. The observation was performed from April to August in 1979.1) Sum of the latent and sensible heat fluxes on the row surface of the mulched plot (No. 3) at night was remarkably increased by about 3.7 times that of unmulched plot (No. 1).When the plant cover was still small (June 4), it did not much affect the soil heat flux regardless of mulched or not. But, on July 26 (LAI, No. 2: 2.56, No. 4: 3.92) the vegetation lessened the ratio of soil heat flux to the daily amount of total net radiation, and these values were 3-4% both in mulching and unmulching.2) The plant canopy and film mulching controlled the rising of maximum temperature and the falling of minimum temperature, namely they lessened the diurnal range of soil temperature. Their effects could be called the buffer action.3) Mulching effect on soil temperature can be also showed by the ratio of diurnal range of temperature (daily range in treated plot/that in the not-treated one). The effect of film mulching (daily range of No. 3/that of No. 1) was reduced with the increase of daily insolation amount. When the amount came to 486cal cm-2day-1 the mulching effect disappeared.4) When transmissivities of solar radiation (above 40%) or the thickness of growth were same, the ratio of diurnal range of soil temperature in mulched plot (No. 4/No. 3) was greater than that of unmulched plot (No. 2/No. 1). This shows the difference in effects of soybean canopy between the case of mulching and not mulching. The ratio of No. 4/No. 1, which indicates the total effect of plant canopy and film mulching, was less than that of only plant plots (No. 4/No. 3) in early season.
Authors: Haruo SUZUKI, Eiji SAKURAI, Koichi MIYAMOTO
Institution: Kagawa University
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2316339592