Abstract

FURCAL-BERIGUETE, Parménides  and  HERRERA-BARRANTES, Alejandra. Efecto del silicio y plaguicidas en la fertilidad del suelo y rendimiento del arroz. Agron. Mesoam [online]. 2013, vol.24, n.2, pp.357-364. ISSN 2215-3608.

Effect of silicon and pesticides in soil fertility and rice yield. The objective of this work was to evaluate the effect of silicon on the soil fertility, the incidence of diseases and insect pests, the yield and quality of rice grains, variety CR 4477. The study was conducted in La Vega, Florencia, San Carlos, Costa Rica between May and Octuber in 2010 and 2011 in the same field. Five treatments were established: silicon to soil, silicon to soil plus pesticides (chemical alter-natives), silicon to foliage, silicon to foliage plus pesticides and a commercial control. Sources were silicon powder at 70% of SiO₂ applied 15 days before sowing at a dose of 100 kg SiO₂/ha and 40% SiO₂ and 36% MgO concentrated liquid applied to the foliage at a dose of 4 l/ha at 17 and 30 days after planting. The soil was an alluvial formation inceptisol order, and at the beginning of the experiment had a pH of 4.9, P and Si values of 29 and 44.7 ppm respectively, exchangeable acidity 1.2 cmol(+)/l and base sum 19.11 cmol(+)/l. The results showed no effect of silicon in soil fertility, the incidence of pests and diseases, and milling quality, except that the combination of silicon applied at soil and the pesticides used increased the zinc and copper content in the soil, also the zinc and magnesium in the leaves of rice, but this effect did not result in yield and grain quality. Results also suggest that the use of pesticides positively influenced weight and paddy yield (p ≤ 0.05).

Keywords : Oryza sativa; soil acidity; silicon applied to soil; zinc in rice leaves.

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