Objetivou-se estudar o comportamento dos atributos físicos e dos teores e estoques de carbono do solo em sistema agroflorestal multiestratificado (SAF), comparativamente a diferentes modalidades de uso solo, sendo elas o cultivo de cacaueiro sob manejo agroecológico (CAC), pastagem cultivada (PAS) e floresta nativa (FLN). A área de estudo localiza-se na estação experimental da CEPLAC em Ouro do Preto do Oeste, RO. Nos quatro tratamentos foram instaladas, ao acaso, cinco parcelas de 20 m x 30 m. Nessas parcelas, foram coletadas amostras de solo indeformadas e deformadas nas profundidades de 0 a 20 cm e 20 a 40 cm, para determinação dos atributos fiscos e estoque de carbono no solo. Os valores de densidade do solo no SAF, CAC e PAS apresentaram-se elevados e influenciaram negativamente o espaço poroso do solo. Os estoques de C foram influenciados pelos diferentes agroecossistemas, sendo que na camada de 0 a 20 cm foram de (Mg m-3): 24,79 (SAF); 42,71 (CAC); 41,30 (PAS); 36,07 (FLN), e na camada de 20 a 40 cm foram (Mg m-3): 17,26 (SAF); 31,06 (CAC); 22,31 (PAS); 25,49 (FLN). Todos os sistemas avaliados apresentaram resultados esperados para estoque de C no solo, no entanto, arranjos espaciais que favoreçam o aporte de matéria orgânica poderiam contribuir para a elevação dos estoques de carbono do solo em sistemas agroflorestais.
The objective of this work was to evaluate the degree of compatibility and agronomic performance in clonal genotypes of canephora coffee plants (Coffea canephora ex Froehner) for cultivation in the state of Rondônia, Brazil. The study was conducted with nine genotypes with three replications of Coffea canephora Arranged in the field: UFRO-60; UFRO-31; UFRO-61; UFRO-25; UFRO-03; UFRO-08; UFRO-21; UFRO-05 and UFRO-138 In adulthood and in two years of harvest (2013/2014 and 2014/2015). We evaluated: productivity, profitability, conversion index fruit cherry/grain benefited, mass of one hundred grains benefited, average diameter of the fruits, number of rosettes per branch, average distance between rosettes and number of fruits per rosette. Additionally, the degree of compatibility between the clones of clonal. The genotypes of Coffea canephora with the best agronomic performances evaluated for the edafoclimatic conditions of the State of Rondônia in this study were UFRO-08, UFRO-25, UFRO-03 and UFRO-138. According to the compatibility tests, the sequence of correct disposition in the field of Coffea canephora among the genotypes studied in this study are: UFRO-138; UFRO-31; UFRO-25; UFRO-08; UFRO-60; UFRO-21; UFRO-61; UFRO-03 and; UFRO-05. Close to 74% of the tests Were and self-pollination tests resulted in low fruiting, evidencing the characteristic of self-incompatibility.
Rambutan (Nephelium lappaceum) fruit is a potential non-timber forest in tropical countries such as Indonesia due to its high economic potential. However, it is necessary to know the silvicultural aspects of the species in order to produce high-quality seedlings. The volume of the tube used and the spacing between seedlings can influence the quality of the seedlings. Thus, this work aimed to evaluate the production of seedlings of N. lappaceum through different densities of seedlings per tray and volumes of tubes. The experiment was installed in the nursery of the Technology Foundation of the state of Acre in Rio Branco. A completely randomized design with two factors (2 × 3) was adopted, considering two volumes of tubes, 110 cm³ and 180 cm³, and three seedling densities per tray, 1/3, 2/3, and 3/3. After 120 days, it was observed that the seedlings produced in tubes with a volume of 180 cm3 had greater aerial length and stem diameter in relation to the density of seedlings per tray, seedlings produced in less dense trays (1/3) had a higher Dickson quality index. Therefore, it is inferred that seedlings of N. lappaceum are favored when tubes with a volume of 180 cm³ and a density per tray of 1/3 are used.
Keywords: Dickson quality index, fruitful species, initial growth, non-timber forest product, seedling production
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