The diagnosis of boron deficiency in coconut palms has been hampered by lack of information about its distribution in the plant. Two experiments were conducted, one in a greenhouse to induce boron deficiency in dwarf ...The diagnosis of boron deficiency in coconut palms has been hampered by lack of information about its distribution in the plant. Two experiments were conducted, one in a greenhouse to induce boron deficiency in dwarf green coconut palms, and other in the field, in which the plants received doses of boric acid, B(OH)3. The objective was to verify symptoms of boron deficiency and boron content variation in canopy, leaves and folioles (or leaflets). Boron deficient plants led leaves and folioles to become deformed. The deficient and sufficient contents of boron varied significantly in the canopy, but did not vary in leaves. The boron content increased significantly from bottom to the apex of the folioles in both treatments. To survey the level of boron in the coconut palm, the ideal is, using samples taken from the youngest leaf, to calculate the relation between the boron content in the apex of the foliole and the content in the center or in the folioles bottom, with minimum values 2.2 or 2.7, respectively.展开更多
This paper was developed in order to verify the influence of nitrogen fertilization and different genotypes in the nutritional aspect and in the production of total phenols in passifloraceae. The experimental design w...This paper was developed in order to verify the influence of nitrogen fertilization and different genotypes in the nutritional aspect and in the production of total phenols in passifloraceae. The experimental design was randomized blocks in a 5 × 2 × 2 factorial scheme, being five genotypes of Passiflora (three genotypes of Passiflora edulis, a genotype of Passiflora alata and a genotype of Passiflora ligularis), two levels of cow manure (with and without) and two doses of N (20 and 80 g), with four replicates. At 120 days after sowing, levels of foliar nutrient and total phenols were determined. Foliar N content varied depending on N doses, organic fertilization and the genotypes used. Foliar levels of P and K were higher when all genotypes received organic fertilization, while the levels of Fe and Mn were similar regardless of this fertilization. The levels of Ca and Mg were higher related to organic fertilization and the genotypes, in isolation. But the foliar contents of S, Zn and Cu increased only in relation to the used genotypes, and the average foliar content of total phenols found was 19.4 g·kg-1, ranging from 13.1 to 23.2 g·kg-1, being the lowest value observed in Passiflora alata without fertilization with cow manure. It is concluded that the nutritional requirement for N is greater for genotypes of the species Passiflora edulis in relation to the species Passiflora alata and Passiflora ligulares, and that the organic fertilization influences positively in the production of total phenols only for the genotype of sweet passion fruit.展开更多
基金Instituto Federal de Educacao,Ciencia e Tecnologia do Espírito Santo—IFES for the financial support for the translation of this article.
文摘The diagnosis of boron deficiency in coconut palms has been hampered by lack of information about its distribution in the plant. Two experiments were conducted, one in a greenhouse to induce boron deficiency in dwarf green coconut palms, and other in the field, in which the plants received doses of boric acid, B(OH)3. The objective was to verify symptoms of boron deficiency and boron content variation in canopy, leaves and folioles (or leaflets). Boron deficient plants led leaves and folioles to become deformed. The deficient and sufficient contents of boron varied significantly in the canopy, but did not vary in leaves. The boron content increased significantly from bottom to the apex of the folioles in both treatments. To survey the level of boron in the coconut palm, the ideal is, using samples taken from the youngest leaf, to calculate the relation between the boron content in the apex of the foliole and the content in the center or in the folioles bottom, with minimum values 2.2 or 2.7, respectively.
文摘This paper was developed in order to verify the influence of nitrogen fertilization and different genotypes in the nutritional aspect and in the production of total phenols in passifloraceae. The experimental design was randomized blocks in a 5 × 2 × 2 factorial scheme, being five genotypes of Passiflora (three genotypes of Passiflora edulis, a genotype of Passiflora alata and a genotype of Passiflora ligularis), two levels of cow manure (with and without) and two doses of N (20 and 80 g), with four replicates. At 120 days after sowing, levels of foliar nutrient and total phenols were determined. Foliar N content varied depending on N doses, organic fertilization and the genotypes used. Foliar levels of P and K were higher when all genotypes received organic fertilization, while the levels of Fe and Mn were similar regardless of this fertilization. The levels of Ca and Mg were higher related to organic fertilization and the genotypes, in isolation. But the foliar contents of S, Zn and Cu increased only in relation to the used genotypes, and the average foliar content of total phenols found was 19.4 g·kg-1, ranging from 13.1 to 23.2 g·kg-1, being the lowest value observed in Passiflora alata without fertilization with cow manure. It is concluded that the nutritional requirement for N is greater for genotypes of the species Passiflora edulis in relation to the species Passiflora alata and Passiflora ligulares, and that the organic fertilization influences positively in the production of total phenols only for the genotype of sweet passion fruit.
