Resumo

PUENTES PARAMO, Yina Jazbleidi; GOMEZ CARABALI, Arnulfo  e  MENJIVAR FLORES, Juan Carlos. Influence of the relationship among nutrients on yield of cocoa (Theobroma cacao L.) clones. Acta Agron. [online]. 2016, vol.65, n.2, pp.176-182. ISSN 0120-2812.  https://doi.org/10.15446/acag.v65n2.47387.

Relations among nutrients affect the plant nutrition, promoting growth and yield of crops. Therefore, this study aimed to determine the influence of the relationships among foliar nutrients on the yield of four clones of fine cocoa (Theobroma cacao L., two clones self-incompatible, TSH-565 and ICS-39, and two self-compatible, CCN-51and ICS-95. Different doses of fertilization were applied to determine which one of this nutrient ratio affect more the yield. A complete randomized block design with five treatments and four replications was used; CT (control), treatments T1, T2, T3 and T4 successively showed increments of NPK, respectively of 25%, 50%, 75% and 100% . Results showed differences in nutrient concentration in leaf under the clone influence , treatment and interaction clone treatment; the clone effect on P, Mg2+, B, Mn2+ and Zn2+; the treatment effect in all nutrients and interaction effect clone*treatment in N, P, Mg2+, B, Fe2+, Mn2+ and Zn2+; this indicates that the applied fertilizer levels influencing the availability and absorption of nutrients. Overall all clones had affinity for Mg2+, S2+and P; in different order of preference for N, K+, Ca2+ and the minor elements for Mn2+, Fe2+, Zn2+, Na+, B and Cu2+, except TSH-565. From the sixty six relationship among nutrients studied at the foliar level, it was found that the relationships among nutrients that showed better association to the yield were: N/Mg, N/P, N/S, N/K, the first two had positive effect and the remainder showed negative effect on yield

Palavras-chave : Clone self-incompatible; clone self-compatible; fertilization; plant nutrition; Theobroma cacao.

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