Effect of P fertilizers use on rice (Oryza sativa) productivity in Southern Province of Rwanda, Rwasave marshland.
The present study aimed at evaluating the effect of P fertilizers on rice productivity in
Rwandan marshlands. It was conducted in Rwasave marshland. A Randomized Complete Block
Design (RCBD) experiment comprised four P treatments [T1 as 0 kg (control), T2: 30kg, T3:
60kg, T4: 90kg of P2O5] replicated four times and Yunkeng was the test rice variety. The soil
samples were randomly collected at 0-30cm depth and various chemical and physical analyses
conducted. The results revealed the significant difference (p<0.05) among treatments for
available P. The laboratory results were pHH2O of 5.37, pHKCl of 4.13 and available P (Bray I) of
4.03ppm. The P2O5 had significant (p<0.05) effect on grain yield and yield components and
increased the plant height (109.0 cm), tillering, 241 filled grains/panicle, empty grains/panicle,
1000grains weight (50.6gm), and panicle numbers. Tillering activity was the growth parameter
that affected most significantly the grain yield. P rich fertilizer (P2O5) applied at 90kg P ha-1
produced the highest grain yield (7.69t/ha) against the lowest grain yield (3.31t/ha) of control.
This study revealed that the supply of P fertilizers for some farmers did not meet the rice
requirements. The response of rice to P application depends on available soil P levels. It is
necessary to apply P fertilizers with adequate doses and at the right time in order to maintain the
stability of available P in the soil.
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