Vigor em sementes e plântulas do cajueiro anão-precoce (Anacardium occidentale L.), clone cp 09, sob pré-embebições e pesos de castanha.

Abstract

The Common cashewtree produces 250 kg/ha/year of cashewnuts, while Pacajus (CCP) cashewtree clones produce 1300 kg/ha/year. Nevertheless, scientific informations about their seeds are dearth. The research was carried out at the Seeds Analyses Laboratory, of the Federal University of Ceará, in Fortaleza, and at the Experimental Station of the Agricultural and Livestock Research Enterprise of Ceará, in Barreira, Ceará, Brazil, with the following objectives: to verify the influence of the cashewnuts pré-imbibition in water (oxygenated = OX; not oxygenated = NO) as well as the cashewnuts weight (CW) on water uptake (WU), emergency percentage (EP) and emergency velocity (EV) of cashewnuts of the CCP 09 and on height (PH-33, 47 and 61 days), girth (PG-33, 47 and 61), leave number (LN-33, 47 and 61) of seedlings and on the seedling aerial dry weight (SADW). The results were: a) WU - there was influence of the OX and CW, on direct proportion to time and CW; b) PE - There was not treatment effect and the general average was 99,20%; c) EV - there was influence of pré-imbibition, but it did not show difference between the types, in according time; CW influenced it whem interacting wih pré-imbibition only, with OX been superior to the NO for the weights of 9,75 g and 6,75 g; there was correlation between EV and WU; the best treatments average for EV was about 11,00 days against 16,83 days of the controls; d) PH - there was effect of pré-imbibition on PH-33 only, while CW influenced PH-33, 47 e 61, in according weight classes; on PH-47 CW and NO interacted, reducing it for 9,75 g and 6,75 g; e) PG - there was effect of pré-imbibition on PG-33 and effect of first grade to the CW; on PG-47, there was second grade effect of pré-imbibition time; the two largest classes of weight gave the same results and were superior to the smaller one; on PG-61, the results were similar to the PG-47 for time; f) NF - the pré-imbibition and the CW influenced NF-33 and 47 with first grade effect; on NF-61 the CW of the heavy and intermediate weight classes were similars and superior to the light class; g) conjugated variance analysis to the AP, DC and NF - evaluation time has influenced them, with first grade effect; there was correlation among these variables; h) PMSPA - There was effect of pré-imbibition and of CW, in according weight classes.