Effect of P-Dipping on Growth of NERICA 4 Rice in Different Soil Types at Initial Growth Stages

Emmanuel Odama, Yasuhiro Tsujimoto, Shin Yabuta, Isao Akagi, Rael Chepkoech, Ibrahim Soe and Jun-Ichi Sakagami ()
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Emmanuel Odama: The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-8580, Japan
Yasuhiro Tsujimoto: Crop, Livestock and Environment Division, JIRCAS, Ibaraki 305-8686, Japan
Shin Yabuta: Faculty of Agriculture, Setsunan University, Osaka 573-0101, Japan
Isao Akagi: Faculty of Agriculture, Kagoshima University, Kagoshima 890-8580, Japan
Rael Chepkoech: The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-8580, Japan
Ibrahim Soe: The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-8580, Japan
Jun-Ichi Sakagami: The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-8580, Japan

Sustainability, 2023, vol. 15, issue 21, 1-13

Abstract: Phosphorus (P) deficiency resulting from P fixation is a major constraint limiting sustainable rice cultivation in sub-Saharan Africa. Soil texture also affects P availability and use efficiency. In a factorial experiment, we evaluated the combined effect of soil texture (sand, clay loam, and clay) and P treatments P-dipping (Pdip) and two other broadcasted P fertilizer levels (Brod1 and Brod2) on the growth of NERICA 4 rice in the initial growth stages. Across all soil textures and P treatments, total plant biomass ranged from 1.06 to 4.63 g pot −1 . The Pdip treatment significantly increased shoot and root biomass relative to control from 1.27 to 1.98 and 0.23 to 0.38 g pot −1 , respectively. Mean photosynthetic rate values under Pdip (20.1 μmol m −2 s −1 ), Brod2 (19.5 μmol m −2 s −1 ), and Brod1 (19.3 μmol m −2 s −1 ) treatments showed significant 42%, 37%, and 36% increases over control, regardless of soil texture. In a striking contrast, P-dipping significantly promoted growth of root length under clay soil, but without a commensurate increase in shoot P uptake. Contrary to our hypothesis, the interactive effect of soil texture and P-dipping influenced NERICA 4 shoot and root physiological and morphological characteristics under clay loam soil texture as opposed to clay.

Keywords: phosphorus; Oryza sativa L.; nutrient uptake; photosynthetic rate; root morphology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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