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Effect of Bulk Density and Seed Placement on Upland Rice Seedling Emergence
Author(s) -
Varade S. B.,
Ghildyal B. P.
Publication year - 1968
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1968.00021962006000020029x
Subject(s) - seedling , limiting , sowing , bulk density , agronomy , water content , moisture , environmental science , materials science , soil water , biology , soil science , geology , composite material , geotechnical engineering , mechanical engineering , engineering
An experiment was carried out under laboratory conditions to find out the critical bulk density and seed placement depths for upland rice seedling emergence. Aluminum cylinders were used to accomplish various combinations of bulk densities and depths of seed placement by compacting soil at moisture content of 9%. Seedling emergences was observed till the 10th day after sowing in a constant temperature incubator of 35 C. Depths down to 8 cm with 1.6 g/cc or 0.7hg/cm 2 pressures and lower densities and pressures were not limiting for seedling emergence when moisture was above field capacity. Depths beyond 8 cm with these densities and below 5 cm with 1.7 and 1.8 g/cc bulk densities seem to be limiting. The pressure of 2.8hg/cm 2 at 10 cm depth became so critical that the emergence ceased totally. It seems that the mechanical impedance or the increased soil strength with increasing bulk densities affected seedling emergence adversely.