Abstract:
Rice (Oryza sativa L.) is one of the most important cereal crops in Rwanda.
Present study was aimed assessed the effect of stabilized ortho silicic acid
(OSA) based granules on growth and yield of rice. Field experiments were
conducted at Rwagitima, Gatsibo district in the Eastern province of Rwanda
during two wet seasons in 2019, the first season was between February and
May and the second one was from September to December. Two levels of
recommended fertilizer doses (RDF; i.e., 200 kg ha−1 NPK as a basal fertilizer
and 100 kg ha−1 urea as a top dressing fertilizer) were applied solely and
along with different doses (10, 15 and 20 kg ha−1) of OSA based granules. The
treatments were: T1 (100% RDF), T2 (75% RDF), T3 (T1 +10 kgha−1 OSA), T4 (T1
+15 kgha−1 OSA), T5 (T1 +20 kgha−1 OSA), T6 (T2 +10 kgha−1OSA), T7 (T2 +15
kgha−1 OSA) and T8 (T2 +20 kgha−1 OSA). Experiments were laid in
a randomized complete block design (RCBD) with three replications.
Results showed that the application of 100% RDF +20 kg ha−1 of OSA
granules increased plant height (99.80 cm), tiller number (361) and root
length (15.7 cm). Furthermore, yield increments of 28.4% and 19.9% for the
first and second seasons, respectively, were obtained in treatments where
100% RDF +20 kgha−1 of OSA granules were applied. The rice yield in the
treatment 75% RDF +20 kg/ha Silixol OSA granules was higher than that
recorded with 100% RDF only. This indicates that use of Silixol OSA granules
can result in 25% saving of fertilizer (NPK and urea) without compromising
the yield. Conclusively, Silixol OSA granules offers good potential for yield
increment of rice in Rwanda and, can minimize fertilizer use by 25%.
