Andrea de Rossi

Aib e substrato na produção de mudas de mirtilo cv. "Climax" através de microestaquia

Although blueberries in the South of Brazil have been researched and produced as a new alternative in the horticulture, the majority of plants are propagated vegetatively through the use of cuttings and the results obtained are unsatisfactory. In this way, this research was aimed at testing the rooting ability of rabbiteye Blueberry by microcuttings techniques. Microcuttings from acclimated plants of Vaccinium ashey Reade cv. Climax obtained through micropropagation were tested. The experiment was carried out in a greenhouse using two types of microcuttings (middle and apex shoots), two substrate (sand and Plantmax®) and three concentrations of indole-3butyric-acid (0, 1000, and 2000mg L-1). After 60th day, it was evaluated: surviving microcuttings percentage, percentage of rooted microcuttings, roots number, roots length, and length more developed root. We concluded that the microcuttings can be an efficient technique for blueberry plantlets production, by using micropropagated plants as explants donors. The use of microcuttings from middle section provided high percentage of survived and rooted microcuttings, independent of IBA concentration. On the other hand, for cuttings from the apex section, the AIB application was required for rooting improvement.

6-Benzilaminopurina e ácido indolbutírico na multiplicação in vitro da amoreira - preta (Rubus idaeus L.), cv. Tupy

SUMMARY This work aimed to evaluate the effect of different BAP levels (0; 2; 4; 6; 8 and 10 µ M) and IBA (0; 0.5 and 1 µ M) on the in vitro multiplication of blackberry, cv. Tupy. The MS nutrient medium was supplemented with myo–inositol (100mg. l -1 ), sucrose (30g. l -1 ) and agar (6g. l -1 ). The cultures were inoculated and then kept at a 16 hour-photoperiod, temperature of 25 ± 2oC and 25µmoles.m -2 .s -1 radiation. The number of buds and shoots was evaluated weekly for one month. In the final evaluation, it was also taken into consideration the plantlet height and the rate of multiplication. In the absence of IBA, it was observed a higher number of buds, whereas the presence of BAP in the medium, promoted the highest number of buds at 2 µ M, which was achieved in the third week of cultivation. IBA at 0 and 1 µ M promoted a linear decrease in plantlet height when associated with increase in BAP concentrations. It was also observed that an increase in BAP levels for all IBA levels reduced the plantlet height. IBA at 1

Diferentes manejos da cobertura vegetal de aveia pretaem pomar no sul do Brasil

The experiment was managed in the Didactic Orchard of the Agricultural Center of Palma, which belongs to the Federal University of Pelotas (UFPel). The treatments consisted of 5 different managements of black oat crop cover: incorporation of black oat to soil; chemical management with herbicide; lodging; mowing at 5 cm and control (uncovered soil). The sowing of the oat was accomplished by April of 2002 and the installation of the experiment, by the end of August of the same year. The analyzed variables were percentage of soil moisture at a depth of 15 cm, temperature of the soil at a depth of 5 cm, percentage of organic matter of the soil, soil resistance to the penetration and identification and degree of infestation by weeds. The experiment was managed in randomized blocks, with 3 blocks, 5 treatments and one repetition. The data were submitted to analysis of the variance through F test and the averages compared by Duncan Test. Maintenance of crop covering in orchard propitiated smaller temperature and larger soil moisture; the soil turn-over increased the diversity of weeds and the incorporation of black oat, after 60 days, had the same behavior as the uncovered soil.

Plantas de cobertura de solo em pomar de pessegueiro (Prunus persica L. Batsch) conduzido no sistema de produção integrada

This research was carried out in the South of Brazil with the objective to examine the effects of five cover crops and their combinations on peach orchard leaded in Integrated Crop Management. The experimental orchard was installed in 1999 at 1.5 x 5.0m planting density, with two training systems: Central Leader (CL) and Ypsilon Shape (Y). The increment on trunk diameter, the increment on foliage size, the frequency productive buds, fruit yield, fresh and dry matter were evaluated. The combination of different cover crops was beneficial considering the productivity with distinction to the Avena strigosa+Pisum sativum combination. The trunk diameter of peach tree was not influenced by cover crops. Nevertheless, the foliage size, frequency productive of buds, and productivity were significantly affected by the cover crops.