Water use efficiency of marandu palisadegrass as affected by nitrogen and sulphur rates

Abstract

-This study aimed to evaluate the effects of combination of nitrogen and sulphur fertilizations on water consumption and water use efficiency by marandu palisadegrass (Brachiaria brizantha cv. Marandu). The experiment was carried out in a greenhouse, using a Typic Quartzipsamment. Five nitrogen rates (0; 100; 200; 300 and 400 mg dm -3 ) were combined with five sulphur rates (0; 10; 20; 30 and 40 mg dm -3 ) in a fractionated 5 2 factorial, with four replications. The leaf area was harvested three times at intervals of approximately 30 days. Soil moisture was maintained at 70% of capacity retention through a self-irrigating system. There was an increase in consumption and water use efficiency by the forage grass due to the supply of nitrogen and sulphur. Nitrogen fertilization increased the consumption and efficiency of water use in the first growth period (35 days after the transplanting of seedlings). Nitrogen and sulphur supply were more effective in increasing water consumption in the third growth period. For water use efficiency this fact was observed in the second and third growth periods of the Marandu palisadegrass.Key words: Marandu palisadegrass. Plants and water. Plants-nitrogen effect. Plants-sulphur effects.RESUMO -Neste estudo objetivou-se avaliar a combinação de doses de nitrogênio e enxofre no consumo e eficiência do uso da água pela Brachiaria brizantha cv. Marandu. O experimento foi conduzido em casa de vegetação, utilizando-se um solo classificado como Neossolo Quartzarênico Órtico típico. Cinco doses de nitrogênio (0; 100; 200; 300 e 400 mg dm ) e m um f a tori al 5 2 fracionado, com quatro repetições. A parte aérea do capim foi cortada três vezes em intervalos aproximados de 30 dias. A água do solo foi mantida a 70% da capacidade de retenção por meio de um sistema autoirrigante. Ocorreu aumento no consumo e na eficiência do uso da água pela gramínea forrageira em razão do fornecimento de nitrogênio e enxofre. A adubação com nitrogênio incrementou o consumo e a eficiência no uso da água no primeiro período de crescimento (35 dias após o transplantio das mudas). O fornecimento simultâneo de doses de nitrogênio e enxofre foi mais efetivo no aumento do consumo de água no terceiro período de crescimento. Para a eficiência no uso da água esse efeito foi observado no segundo e terceiro períodos de crescimento do capim-marandu.Palavras-chave: Capim-marandu. Plantas e água. Plantas-efeito do nitrogênio. Plantas-efeito do enxofre.

Effect of Nitrogen Rates on Growth and Quality of Water Spinach (Ipomea aquatica)

“…[22]. A similar result was obtained by Artur et al [39] where the increase of N has reduced the WUE in Marandu grass that showed a hig application of nitrogen can reduce stress in aquatica. the WUE in Marandu grass that showed a high application of nitrogen can reduce stress in I.…”

Forage production, morphogenetic and structural components, and nutritional value of tropical grasses in the semiarid condition

“…Mombaça possibly lead to a larger photosynthetic area, resulting in higher forage mass, as supported by the higher SPAD, although the difference in LAI was not statistically significant. The low rainfall in the present study particularly in the middle of the experimental period can be influenced by soil water availability and atmospheric evaporative demand (Artur et al, 2014). Moreover, each species adapted differently, which explains the present results.…”

Ryegrass cv. Lema and guava cv. Paluma biomonitoring suitability for estimating nutritional contamination risks under seasonal climate in Southeastern Brazil

“…The ryegrass plants tended to accumulate more nitrogen during the wet season, an expected result if we consider that water plays an important role in the nitrogen uptake by plants, and thus in the absorption of other nutrients (Artur et al, 2014). These authors found significant interaction between nitrogen and sulfur rates in terms of the amount of water consumed by Brachiaria brizantha plants.…”