Nitrogen and potassium combinations for mombaça grass yield and mineral nutrition

Authors

  • José Lavres Junior 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:

nutrient interaction, nutrient solution, Panicum maximum, response surface

Abstract

An experiment was carried out in greenhouse conditions from November 2000 to February 2001 with Panicum maximum Jacq. cv. Mombaça grown in a nutrient solution with ground quartz as substrate. The experiment was set in an incomplete 52 factorial of nitrogen and potassium. Thirteen combinations between nitrogen and potassium rates (28N and 19.5K; 28N and 234K; 28N and 429K; 112N and 117K; 112N and 312K; 210N and 19.5K; 210N and 234K; 210N and 429K; 336N and 117K; 336N and 312K; 462N and 19.5K; 462N and 234K; 462N and 429K) were obtained according to design points of the modified central composite nonrotatable design that was set in a randomized complete block design, with four replications. The objectives were to evaluate the plant tops and roots dry matter yield and the mineral composition of the lamina of recently expanded leaves (RL) with respect to nitrogen, potassium, calcium, magnesium and sulphur. The results showed that the nitrogen X potassium interaction was significant (P<0.01) for plant tops and roots dry matter yield of Mombaça grass; nitrogen and sulphur concentrations in RL and calcium concentration in RL at the second harvest. Potassium and magnesium concentrations in RL were affected by potassium rates, at both harvests.

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Published

2013-11-29

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Nitrogen and potassium combinations for mombaça grass yield and mineral nutrition. (2013). Bulletin of Animal Husbandry, 59(2), 101-114. http://bia.iz.sp.gov.br/index.php/bia/article/view/1360

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