Yield parameters, phosphorus status and acid phosphatase activity in signal grass grown in nutrient solution

Authors

  • Carla Rossi Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Solos e Nutrição de Plantas, Piracicaba, SP
  • Francisco Antonio Monteiro Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Solos e Nutrição de Plantas, Piracicaba, SP

Keywords:

Brachiaria decumbens, phosphorus concentration, acid phosphatase, shoot/root ratio

Abstract

An experiment was carried out in greenhouse conditions, with signal grass (Brachiaria decumbens Stapf), from January to March 1998. Eight rates of phosphorus were used (0.31, 0.93, 1.55, 3.1, 9.3, 15.5, 31.0 and 46.5 mg L-1 of nutrient solution). The experiment was set in complete randomized block design, with four replications. The plants were harvested at 40 days after transplanting, and were separated into shoots and roots. Plant tops and roots yield, and phosphorus concentration in both plant tissues significantly (P<0,01) changed with the phosphorus rates. Shoot to roots ratio increased with the phosphorus rates, changing from 2.6 to 6.5. Roots had lower phosphorus concentrations than shoots. The activity of acid phosphatase decreased with the increase of phosphous rates up to 31.0 mg L-1. The critical level for acid phosphatase activity was about 20 mmol p-NPP h-1 g-1 FW for this grass.

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Published

2013-12-03

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Yield parameters, phosphorus status and acid phosphatase activity in signal grass grown in nutrient solution. (2013). Bulletin of Animal Husbandry, 56(2), 127-135. http://bia.iz.sp.gov.br/index.php/bia/article/view/913

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