Abstract

AGUILAR-LUNA, Jesús Mao Estanislao et al. Above and below ground interactions in the agroforestal association red cedar-persian lime-chaya. Trop. subtrop. agroecosyt [online]. 2011, vol.14, n.2, pp.441-451. ISSN 1870-0462.

Above and below ground interactions were analyzed in the agroforestal association "red cedar-Persian lime-chaya", to know the initial optimum planting density (PD), in Quintana Roo, Mexico. Red cedar and Persian lime were placed in a 'Nelder' circle of 3154 m² which consisted of 20 concentric circles alternating red cedars and Persian limes to 1.50 m apart and 10 plants per circle; chaya rectangular frame was set at 1.50 x 3.00 m, superimposed on the 'Nelder' circle. Defined eight PD 2602 to 3772 pl·ha^-1 with 10 repetitions, to evaluate the length of main root (LMR), radical exploration range (RER), below ground interaction (BGI), plant height (PH), crown diameter (CD), above ground interaction (AGI) and soil fertility (SF). The growth intraspecific he present statistical difference (P≤0.05) when moving from one PD to another PD, while the growth interespecific manifested different growth habit. The agroforestal association propitious in soil decreased phosphorous ±2 %, and increases organic matter ±14 % and nitrogen ±10 % on all PD. The BGI was increased in direct relation with the PD, reaching its highest value (64±5.8 %) to 3772 pl·ha^-1; the AGI also increased in direct relation with the PD, its highest value (52±3.1 %) went to 3772 pl·ha^-1; therefore, to higher PD increased BGI and AGI, at 20 months after planting.

Keywords : Cedrela odorata; Citrus latifolia; Cnidoscolus chayamansa; planting density; Nelder design.