Organic amendments and microbial inoculants in sugarcane (Saccharum officinarum L.) production
1994
Samson, E.G.
ARA [acetylene reduction assay] in the roots was inhibited by N application while high N application increased ARA in the rhizosphere. Higher ARA was observed in zero-N treatments in the roots while a lower ARA was demonstrated in the rhizosphere. High N applications tend to inhibit the number of mycorrhizal spores in the rhizosphere. Inoculation appeared to reduce the ARA in treatments with compost and fertilization in the roots and in the rhizosphere. Inoculation and application of fertilizers and compost at 2 tons per hectare stimulated spore formation of VA mycorrhiza in the rhizosphere. Cane and sugar yields were not affected by combination of inoculation and fertilizer application but were significantly affected by N fertilizer application. The lack of response to P fertilizer application could be attributed to adequate P (21 ppm). Inoculation plus one-half of the recommended rate of N significantly increased the number of millable and weight of sugarcane stalks. Recommended rates of N and K (without P) fertilization generated the highest net revenue of P19,781.92, but gave the second highest returns to labor and material costs and benefit-cost ratio. Plots receiving 25 percent fertilizer of recommended NPK fertilization rate plus two tons/ha compost (T6) gave yields comparable to those of plots fertilized with full NPK (T2). T6 also gave a net income of P14,554.02 which was slightly lower than that obtained from T2. Moreover, T6 showed a higher return to material costs and benefit-cost-ratio
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