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Growth and accumulation of nutrients in hybrid squash Tetsukabuto

An experiment was carried out at Jaíba, Northern Minas Gerais State, to evaluate the growth and accumulation of nutrients in hybrid squash cv. Suprema. The samplings of plants were taken at 28; 42; 56; 70; 84, and 98 days after the sowing (DAS) for dry matter determination of leaves, stem, flower, fruit and root. The plants grew slowly up the 56 DAS, intensifying thereon. The total production of maximum dry matter occurred at 89 DAS, reaching 1657.92 g plant-1. The fruits accumulated more dry matter than the other organs of the plant. The rate of absolute growth of plants and fruits were 124.25 and 172.75 g plant-1 day-1, at 74 days and 79 days, respectively. The nutrient absorption patterns followed the plant dry matter accumulation. The accumulation of nutrients was low in the first 42 days, intensifying thereon for N, S, Mg, and the micronutrients. K was the nutrient more absorbed by the plant, followed by N and Ca. The order of accumulation of nutrients was K>N>Ca>P>Mg>S and Fe>Mn>Zn>Cu. In the crop, at 98 days, 69% of the dry matter was allocated in the fruits, 19% in the leaves, 8% in the stem, and the remaining in the flowers and roots. The nutrients N, K, S, and Cu accumulated in the fruits, while P, Ca, Mg, Zn, Fe, and Mn accumulated in the vegetative part. The fruits exported 51.0 kg ha-1 of N; 12.4 kg ha-1 of P; 61.4 kg ha-1 of K; 3.6 kg ha-1 of S; 8.8 kg ha-1 of Ca and 3.5 kg ha-1 of Mg, and 11.4 g ha-1 of Cu; 61.6 g ha-1 of Zn; 126.6 g ha-1 of Fe and 44.3 g ha-1 of Mn.

C. maxima x C. moschata; Tetsukabuto; growth analysis; nutrition; macronutrients; micronutrients


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