A large array of soil properties influences plant growth response to phosphorus(P) fertilizer input in acid soils. We carried out a pot experim.nt using three contrasted acid soils from.southern Cam.roon with the foll...
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A large array of soil properties influences plant growth response to phosphorus(P) fertilizer input in acid soils. We carried out a pot experim.nt using three contrasted acid soils from.southern Cam.roon with the following m.in objectives:i) to assess the m.in soil causal factors of different m.ize(Zea m.ys L.) growth response to applied P and ii) to statistically m.del soil quality variation across soil types as well as their relationships to dry m.tter production. The soils used are classified as Typic Kandiudox(TKO) ,Rhodic Kandiudult(RKU) ,and Typic Kandiudult(TKU) . Analysis of variance,regression,and principal com.onent analyses were used for data analysis and interpretation. Shoot dry m.tter yield(Dm.) was significantly affected by soil type and P rate with no significant interaction. Predicted m.xim.m.attainable Dm. was lowest in the TKO(26.2 g pot-1) as com.ared to 35.6 and 36.7 g pot-1 for the RKU and TKU,respectively. Properties that positively influenced Dm. were the levels of inorganic NaHCO3-extractable P,individual basic cations(Ca,m.,and K) ,and pH. Their effects contrasted with those of exchangeable Al and C/N ratio,which significantly depressed Dm.. Principal com.onent analysis yielded sim.lar results,identifying 4 orthogonal com.onents,which accounted for 84.7% of the total system.variance(TSV) . Principal com.onent 1 was identified as soil nutrient deficiency explaining 35.9% of TSV. This soil quality varied significantly am.ng the studied soils,em.rging as the only soil quality which significantly(P m.ize growth. The 2nd,3rd,and 4th com.onents were identified as soil organic m.tter contents,texture,and HCl-extractable P,respectively.
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