Contribution of nutrients, organic amendments and mycorrhizae on the yield components in pecan walnut (Carya ilinoinensis)
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Abstract
structure was used with six factors and five levels for each factor in kg ha-1: N 0; 16; 80; 160 and 320; P2O5 0; 7; 35; 70 and 140; K2O 0; 7,5; 37,5; 75 and 150; Composting 0; 250; 1250; 2500 and 5000; vermicompost 0; 100; 500; 1000 and 2000; mycorrhizae 0; 3,81; 19,05; 38,00 and 76,20 g per cm of trunk diameter. Commercial carriers: Ammonium sulfate (20,5 % N, 24 % S), phosphoric acid (49 % P2O5, density 1,61 kg L-1), potassium thiosulfate (12,6 % K2O, density 1,46 kg L-1); compost vermicompost and mycorrhizae, evaluating the production and quality of the nut. For a production of 1,94 t ha-1,149 nuts kg-1 and 59 % of edible nut were used kg ha-1 226 of N, 121 of P2O5, 94 of K2O, 3111 of Compost, 1905 vermicompost and 33,02 g cm dt of mycorrhizae; of those doses, the requirements for production were 30 % of N and organic amendments, 50 % of P and K; mycorrhizae they contributed 95 % in quality of the walnut. Fertilizer costs accounted for 40,8 % of revenues, which were distributed 50 % for current year quality, 25 % for maintenance of potential production and 25 % for next year’s production.
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