Effects of tillage systems and inoculation on late-seeded soybean
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The no tillage system of early sowings of inoculated soybean seeds allow for higher yields than conventional tillage systems. However, little is known about the performance of different systems in late sowings. A field experiment was carried out in Azul (Buenos Aires, Argentina) with soybean (planted on 29/12/00) to study the crop growth and yield of late sowings in three tillage systems in a colonized rhizobial soil. The tillage systems were: moldboard plow, chisel plow and no tillage with and without strain Bradyrhizobium japonicum—E109— seed inoculant. In terms of dry weight, early growth was 13% higher in moldboard plow and chisel plow as compared with no tillage. During the R3 to R6 growth stages, the growth rate was similar for all inoculation treatments and tillage systems, with direct tillage showing a rapid increase in the percentage of solar radiation interception rate at early reproductive stages. The number of seeds and crop yield were not significantly affected. The crop cycle was shortened to 95 days overall. The soybean yield, in late sowing was not affected neither by the tillage systems or the inoculation treatments.
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