Alfredo Richart

Curva de absorção de água em sementes de atemóia (Annona cherimola Mill. x Annona squamosa L.) cv. Gefner

ABSTRACT - The present study aimed to characterize the water absorption curve in atemoya seeds ( Annona cherimola Mill x Annona squamosa L.) cv. Gefner, submitted to three imbibitions methods: seeds submerged in distilled water (MSSA), seed placed betwen paper fil ter imbibed withdistilled water inside a gerbox box (MPEA) and standard test, with seeds kept in roll of filter paper moistened with water (MTP ). The experimentaldelineation was entirely randomized, with 6 treatments and 4 repetitions of 25 seeds per parcel. The treatments were submitted to three imbibitionsmethods, with live and deth seeds. The imbibition time among 27, 34 and 47 hours, in the MTP, MPEA and MSSA methods represented an indicativefor seeds treatment, which could possibly function as a minimal time needed for imbibition in solution with vegetal regulators. The MTP and MPEAwere the methodologies that provided a better curve characterization, with changes between phases I and II after 27 and 34 hour s, and reaching thephase III after 234 hours, which suggests the immersion time for seeds treatments.

Produtividade de grãos e componentes de produção da canola de acordo com fontes e doses de nitrogênio

The objective of this work was to evaluate the response of canola to nitrogen sources and rates applied at sowing. The experiment was carried out on a dystroferric Red Ferralsol, with a very clayey texture. A randomized complete block design was used, in a 7x2 factorial arrangement, with seven N rates applied on soil surface at sowing (0, 20, 40, 60, 80, 100, and 120 kg ha-1), two N sources (ammonium sulfate and urea), and four replicates. The experiment was carried out with the Hyola 61 hybrid for two years, and the following variables were evaluated: plant height, number of plants per square meter, shoot dry matter mass, pod mass per plant, weight of a thousand grains, grain yield, and protein and oil contents in seeds. The variables were not affected by the N sources. The highest grain yield is obtained with 88 kg ha-1 N. Increasing N rates increase protein contents and reduce oil contents in canola seeds.

Agronomic characteristics and oil content of Brazilian sunflower hybrdids under different sowing densities

The sunflower (Helianthus annuus L.) has good productive capacity and the increase in production is possible by using hybrids adapted to the sowing region and an adequate arrangement of plants without losing quality and oil content. The objective of this work was to evaluate two sunflower hybrids cultivated in different sowing densities, observing the influence on the agronomic characteristics and oil content of the cultivation. The experiment was conducted at the experimental field of the Pontifical Catholic University of Paraná, Toledo. The experimental design was randomized blocks in 2 × 4 factorial scheme, with four repetitions consisted of two plant genotypes (BRS324 and M734) and four plant densities (30, 40, 50 and 60 thousand ha-1 plants). The variables analyzed in the field were: plant height, stem diameter, number of leaves, chapter thickness and chapter size. On the other hand, the variables: mass of one thousand sunflower achene, yield and oil content were analyzed at PUCPR laboratory. According to the results obtained, there was interaction between the density of the BRS324 genotype with plant height, stem diameter and mass of a thousand sunflower achene. For the other variables there was a significant difference as a function of the genotype. The cultivar BRS324 produced a better oil content. For plant height and stem diameter, the cultivar showed opposite behavior, possibly due to adaptation in the western region of Paraná. The variable mass of one thousand sunflower achene was decreased due to the increase of the population density for cultivar BRS324.