Effect of phosphating on soil chemical attributes and cultivation of sugarcane for forage / Efeitos da fosfatagem nos atributos químicos do solo e produção de cana-de-açúcar para forragem

Phosphorus (P) is an essential element for the cultivation of sugarcane, which plays an important role in rooting, tillering and forage production. With the objective to evaluate the effects of pre-planting phosphating on soil chemical attributes and sugarcane growth for forage production, an experiment was conducted at the Santa Mercedes plant, Tupi Paulista, SP, using the RB 86 7515 variety. The experimental design consisted of random blocks with 8 treatments and 4 replicates, totaling 32 experimental units, in a 2 x 4 factorial scheme including two P sources (decanted phosphate and monoammonium phosphate) and four P doses (0, 80, 120, and 160 kg/ ha P2O5). The P sources and doses tested increase the availability of P in soil, with the dose of 120 kg/ha P2O5 providing the highest production of green forage mass. Monoammonium phosphate as P source reduces soil pH and increases the availability of micronutrients such as iron, boron and zinc.

O fósforo (P) é considerado um elemento essencial para o cultivo da cana-de-açúcar, assumindo grande importância no enraizamento, no perfilhamento e na produção de forragem. Com o objetivo de avaliar os efeitos da fosfatagem em pré-plantio nos atributos químicos do solo e no desenvolvimento da cultura da cana-de-açúcar para produção de forragem foi realizado um experimento com a variedade RB 86 7515, junto à unidade produtora da Usina Santa Mercedes, Tupi Paulista, SP. O delineamento experimental foi em blocos ao acaso com 8 tratamentos e 4 repetições, totalizando 32 unidades experimentais, em esquema fatorial 2 x 4, duas fontes de fósforo (fosfato decantado e fosfato de monoamônio) e quatro doses de fósforo (0; 80; 120; 160 kg/ha P2O5). As fontes e doses testadas de fósforo (P) aumenta a disponibilidade de P no solo, sendo a dose de 120 kg/ha P2O5 que apresenta maior produção de massa verde de forragem. A fonte fosfato monoamônico reduz o pH do solo e aumenta a disponibilidade dos micronutrientes como ferro, boro e zinco.

Effect of phosphating on soil chemical attributes and cultivation of sugarcane for forage / Efeitos da fosfatagem nos atributos químicos do solo e produção de cana-de-açúcar para forragem

Phosphorus (P) is an essential element for the cultivation of sugarcane, which plays an important role in rooting, tillering and forage production. With the objective to evaluate the effects of pre-planting phosphating on soil chemical attributes and sugarcane growth for forage production, an experiment was conducted at the Santa Mercedes plant, Tupi Paulista, SP, using the RB 86 7515 variety. The experimental design consisted of random blocks with 8 treatments and 4 replicates, totaling 32 experimental units, in a 2 x 4 factorial scheme including two P sources (decanted phosphate and monoammonium phosphate) and four P doses (0, 80, 120, and 160 kg/ ha P2O5). The P sources and doses tested increase the availability of P in soil, with the dose of 120 kg/ha P2O5 providing the highest production of green forage mass. Monoammonium phosphate as P source reduces soil pH and increases the availability of micronutrients such as iron, boron and zinc.(AU)

O fósforo (P) é considerado um elemento essencial para o cultivo da cana-de-açúcar, assumindo grande importância no enraizamento, no perfilhamento e na produção de forragem. Com o objetivo de avaliar os efeitos da fosfatagem em pré-plantio nos atributos químicos do solo e no desenvolvimento da cultura da cana-de-açúcar para produção de forragem foi realizado um experimento com a variedade RB 86 7515, junto à unidade produtora da Usina Santa Mercedes, Tupi Paulista, SP. O delineamento experimental foi em blocos ao acaso com 8 tratamentos e 4 repetições, totalizando 32 unidades experimentais, em esquema fatorial 2 x 4, duas fontes de fósforo (fosfato decantado e fosfato de monoamônio) e quatro doses de fósforo (0; 80; 120; 160 kg/ha P2O5). As fontes e doses testadas de fósforo (P) aumenta a disponibilidade de P no solo, sendo a dose de 120 kg/ha P2O5 que apresenta maior produção de massa verde de forragem. A fonte fosfato monoamônico reduz o pH do solo e aumenta a disponibilidade dos micronutrientes como ferro, boro e zinco.(AU)

Ovarian follicle reserve: emerging concepts and applications

This paper presents new concepts in the study of folliculogenesis and describes some of the current applications to reproductive biotechnology. The importance of better understanding this issue is addressed both for basic and applied research. After a brief review of the basic conceptions of the origin, formation, and growth of follicules according to stablished concepts, some controversial points, as the postnatal production of the follicles and the role of multioocyte follicles, are discussed. The importance of the ovarian follicular reserve is considered for fertility and reproductive parameters, as well as some questiones about the presence of multioocyte follicles in adult ovaries. Finally, some future prospects are proposed.

Ovarian follicle reserve: emerging concepts and applications

This paper presents new concepts in the study of folliculogenesis and describes some of the current applications to reproductive biotechnology. The importance of better understanding this issue is addressed both for basic and applied research. After a brief review of the basic conceptions of the origin, formation, and growth of follicules according to stablished concepts, some controversial points, as the postnatal production of the follicles and the role of multioocyte follicles, are discussed. The importance of the ovarian follicular reserve is considered for fertility and reproductive parameters, as well as some questiones about the presence of multioocyte follicles in adult ovaries. Finally, some future prospects are proposed.(AU)