Stalk yield and nutrients accumulation of sugarcane varieties in three crop cycles

Produção de colmos e acumulação de nutrientes por variedades de cana-de-açúcar em três ciclos de colheita

Vinicius Santos Gomes da Silva^1*, Mauro Wagner de Oliveira², Vilma Marques Ferreira², Terezinha Bezerra Albino Oliveira², Mayame de Brito Santana¹ and Elaine Rocha Galvão³

¹Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, w/n, 52171-900, Recife, Pernambuco, Brasil

²Centro de Ciências Agrárias, Universidade Federal de Alagoas, BR 104, Km 85, w/n, 57100-000. Rio Largo, Alagoas, Brasil

³Departamento de Agronomia, Universidade do Estado da Bahia.  Rua Edgar Chastinet, 48905-680, Cajueiro, Juazeiro - Bahia, Brasil

(*E-mail: vinicius.agro2008.1@gmail.com)

ABSTRACT

Keywords: nutritional requirement, nutrient content, uptake, nutritional efficiency, Saccharum spp.

RESUMO

O conhecimento da exigência nutricional de variedades de cana-de-açúcar é de grande importância para um manuseamento adequado da cultura, pois possibilita a escolha de variedades eficientes no que se refere à utilização de nutrientes, contribuindo para uma melhor utilização de fertilizantes e redução dos custos de produção. O objetivo do trabalho foi avaliar a produtividade de colmos e a acumulação de azoto (N), fósforo (P), potássio (K), cálcio (Ca), magnésio (Mg), enxofre (S), ferro (Fe), zinco (Zn), cobre (Cu) e manganês (Mn) da biomassa da parte aérea de quatro variedades de cana-de-açúcar, RB867515, RB92579, SP813250 e VAT90212, nos ciclos de cana-planta, primeira e segunda rebrota. O delineamento experimental foi de blocos ao acaso com quatro tratamentos e cinco repetições. Na maturação e nos três ciclos de cultivo, a cana foi colhida e foram avaliadas a produtividade de colmos e a acumulação de nutrientes. A produtividade obtida foi de 126, 102 e 86 t ha^-1 nos ciclos de cana-planta, primeira e segunda rebrota, respectivamente. Na cana-planta a acumulação média de macronutrientes foi a seguinte, por ordem decrescente: K > N > Ca >Mg > S > P, enquanto que nas rebrotas a sequência observada foi K > N > Ca > S > Mg > P. As variedades apresentaram alto potencial produtivo e foram semelhantes na acumulação de nutrientes nos três ciclos.

Palavras-chave: Exigência nutricional, teor de nutrientes, absorção, eficiência nutricional, Saccharum spp.

INTRODUCTION

Sugarcane (Saccharum spp.) has a great socioeconomic importance for Brazil, currently the largest producer in the world. Most common uses are for sugar and alcohol production, human and animal feed (Oliveira et al., 2014). Brazil sugarcane area is about 9.0 million hectares, with average yield of 72 t ha^-1 (Conab, 2016).

Currently, the Brazilian sugar and ethanol sector faces an agricultural (reduction in productivity) and industrial (factory closure) crisis. Thus, research is necessary to raise the yield and turn Brazilian cane more competitive. Some studies have recommended the use of liming, chemical or organic compost and green manure to increase sugarcane productivity (Oliveira et al., 2011; Calheiros et al., 2012). Another great practice for sugarcane cultivation success, when possible, is the choice of sugarcane varieties with greater nutritional and productive efficiency adapted to different soil and climatic environments.

Studies conducted in the Center-South of Brazil demonstrated that the varieties could differ in absorption and accumulation of nutrients (Franco et al., 2007; Tasso Júnior et al., 2007). However, there is a lack of nutrient accumulation research in the Northeast of Brazil that evaluates nutrient accumulation by cane varieties, and mostly available information refers to varieties that are no longer cultivated (Oliveira et al., 2010).

The differences in plant nutrient uptake, transport and accumulation are related to the morphological and physiological characteristics of the varieties associated with the absorption kinetics, including the nutrient influx rate, the Michaelis-Menten constant and the minimum concentration for liquid inflow activity occurrence (Marshner, 2012). A good variety is considered efficient when it has the capacity to absorb the nutrients and use them in the biomass production (Mendes, 2006).

According to these considerations, the aim of this study was to evaluate, during plant-cane, first and second regrowth cycles, nutrient utilization efficiency of four varieties that represent more than 50% of sugarcane cultivation in Northeast Brazil.

MATERIAL AND METHODS

The study was conducted in an open field located in the Jequiá Farm, in the county of Anadia, Alagoas (Latitude 09°41'04'' S and Longitude 36°18'15" W). The experimental area belongs to Triunfo Mill, which is located in the county of Boca da Mata – AL. The region has a rainy tropical climate, with dry summers, according to Koppen classification, with rainfall and temperatures annual averages of 1,500 mm (Figure 1) and 29ºC (Silva et al., 2017b).

The soil was classified as a dystrophic Yellow Oxisol (Embrapa, 2013), with medium texture, and chemicals characterization were defined from soil samples collected in the layers 0.0 - 0.2 m; 0.2 - 0.4 m (Table 1). Soil acidity was corrected using dolomitic limestone at a dose of 150 kg ha^-1, calculated considering the method to increase the saturation to 60% (Oliveira et al., 2007). After the limestone application, the soil was ploughed and harrowed, and then the grooves were opened for manual planting using sugarcane stalks with three buds per billets, and planting density between 15 and 18 buds per meter.

The experimental design was a randomized block with five replicates, consisting of four sugarcane varieties: SP813250, RB867515, RB92579 and VAT90212 grown in plots of six grooves of 10.0 meters in length, spaced from 1.0 meter, in a total of 60 m² of area. The four central lines with six meters of length were considered for analysis, making up to 24 m². These varieties were chosen based on their importance of being cultivated in up to 50% of the planted area of sugarcane in the Northeast of Brazil in the year before the implementation of the experiment.

Soil fertilization was based on Usina Triunfo recommendation according to the results of soil analysis (Table 1), applying 60, 100 and 150 kg ha^-1 of N, P₂O₅ and K₂O into the bottom of the groove. The cane was harvested after 14 months, and then the research was realized to the first and second regrowth, each one lasting 12 months. In these cycles all treatments received 500 kg ha^-1 of the formula 20-05-25 (NPK).

When cane reached maturity during the three analyzed cycles, the aerial part of 10 plants of each plot was randomly sampled. After sampling for nutrient accumulation estimative, the production of fresh biomass was determined by weighting the aerial part (stems, leaves and pointers) in an area of 2 m² and then calculated the production of fresh biomass by hectare (t ha^-1).

The data were analyzed using the Sisvar computer program (Ferreira, 2011), the variables were submitted to the analysis of variance by the Test F and, for those in which the F was significant, the means were compared with the Scott Knott test at a 5% probability.

RESULTS AND DISCUSSION

Sugarcane varieties did not differ statistically for shoot yield, with 126, 102 and 86 tons per hectare for plant-cane, first and second regrowth, respectively (Figure 2). There was a 20% reduction in the stalks yield average, comparing the first regrowth to plant-cane, and less 16% from the first to the second regrowth. This productivity reduction between successive cycles has been reported in the literature (Mendes, 2006; Franco et al., 2011; Silva et al., 2017b). The decrease is attributed to the genetic characteristics of the varieties, the cultivars interactions and with the inserted environment (Silveira et al., 2012). Environmental factors related to plant growth such as luminosity, water availability (Oliveira et al., 2011) and mineral nutrients (Caione et al., 2013), as well as the inherent characteristics of varieties such as sprouting, age, and root activity may contribute to the decrease of productivity over the cycles (Manhães et al., 2015).

The results obtained in the present study are similar to both studies obtained by other authors in the Northeast region and the Brazilian productivity average (Oliveira et al., 2011; Calheiros et al., 2012; Conab, 2016). The varieties used presented high productive potential as long as the accumulated biomass productivity can be considered from average to high for the State of Alagoas. Considering the phase of maximum sugarcane growth during short days with low luminosity and the non-coincidence of the maximum water availability, brings a negative impact to the photosynthetic rates, resulting in lower productivity in Alagoas, when compared to the Center-South (Oliveira et al., 2014).

No varietal effect was observed for nitrogen in the three cycles (Table 2). The average accumulation from plant-cane was 182 kg ha^-1, verified by Oliveira et al. (2011), which obtained 179 kg ha^-1 and 24% higher than what was reported by Mendes (2006) that found 137 kg ha^-1. Calheiros et al. (2012) in studies carried out in Alagoas State rainforest area verified for the plant-cane cycle that the varieties RB867515 and RB92579 had the same nutrient absorption capacity, and nitrogen accumulation in the shoot biomass for RB867515 and RB92579 was 220 kg ha^-1.

The high nitrogen extraction by sugarcane is due to its participation as constituent of many plant cells components, including amino acids, proteins and nucleic acids (Taiz and Zeiger, 2013). There are many studies in the literature that show the importance of N in the sugarcane crop (Franco et al., 2011). The nutrient is found only in 1% of the total dry mass of the plant, however its deficiency in the plant can cause a chlorophyll reduction, essential amino acids and the energy synthesis required to produce carbohydrates and carbon skeletons, reflecting directly on the development and crop yield (Taiz and Zeiger, 2013). Thus, the correct nitrogen fertilization application is fundamental to the success of sugarcane cultivation. Studies have shown that once the nitrogen fertilization is inadequate, it can result in the productivity reduction and crop longevity decrease, which causes anticipation of sugarcane plant renovation, increasing costs for producers (Franco et al., 2007).

The phosphorus accumulation was not influenced by the varieties in the three crop cycles (Table 2). In the plant-cane accumulation average in the shoot varieties biomass was 27 kg ha^-1; in the variety RB92579 was similar to the value observed in studies conducted by Calheiros et al. (2012), where they recorded a removal of 25 kg ha^-1 by RB867515 and was higher than the value observed by Oliveira et al. (2010) who obtained a removal of 19 kg ha^-1. Tasso Júnior et al. (2007) obtained an accumulation ranging from 17 to 25 kg ha^-1. In the first regrowth the accumulation average was higher than the value obtained by Benett et al. (2013), who found an average removal of 10 kg ha^-1 for RB867515. In the second regrowth the average accumulation was 19.15 kg ha^-1, this value was higher than that obtained by Gomes (2003) who found 5.07-15.31 kg ha^-1 for the second regrowth.

For sugarcane, the phosphorus bioavailability in the plant can cause large changes in nitrogen uptake and metabolism (Magalhães, 1996). With an inadequate P supply there was a reduction in the nitrate uptake of the nutrient solution and the nitrate transport from the roots to the shoot also decreased, however, in plants with adequate P supply the amino acids accumulation was high in leaves and roots (Alves et al., 1998). Considering the high P availability in the soil, presenting 103 mg dm^-3 of phosphorus, extracted with Mehlich-1 solution (Table 1) in the layer of 0 to 20 cm, ensured that the element did not limit the plant growth.

Potassium was the nutrient accumulated in the highest amount during the three crop cycles, obtaining 219, 191 and 162 kg ha^-1 for plant-cane, first and second regrowth, respectively (Table 3). The highest extraction of this nutrient by sugarcane has been reported in the literature (Oliveira et al., 2011 e 2014). According to Oliveira et al. (2010) for a ton of stalk cane produced, a total of 1.72 kg of potassium are absorbed and removed with harvest. The great sugarcane potassium dependence is explained by the important role that this nutrient plays in regulating the osmotic potential of plant cells, and also activates many enzymes involved in respiration and photosynthesis processes (Taiz and Zeiger, 2013).

In the plant-cane the average accumulation obtained was similar to that observed by Oliveira et al. (2014) in a study conducted in the Serra dos Aimorés - MG, that brought out an average accumulation of 221 kg ha^-1 of K for RB867515 and RB92579. Oliveira et al. (2010) in a study conducted in a Yellow Argisol observed for RB867515 and RB92579 the same capacity of removing potassium extracting, 175 kg ha^-1 in average.

The potassium accumulation average during the first regrowth was 191 kg ha^-1, similar to Mendes (2006), who observed 198 kg ha^-1. In the second regrowth average was 162.17 kg ha^-1, Gomes (2003) obtained values ranging from 152 to 235 kg ha^-1.

For calcium accumulation, in the plant-cane cycle, the values obtained are lower than those obtained by Oliveira et al. (2010) and Mendes (2006), but higher than what was verified by Tasso Junior et al. (2007). The first regrowth presented average values higher than those obtained by Mendes (2006) and Prado et al. (2002) and lower than those observed by Oliveira et al. (2003). In the second regrowth, the average accumulation was 54.82 kg ha^-1 (Table 3).

Magnesium accumulation was 60.26 kg ha^-1, presenting lower values than those obtained by Oliveira et al. (2010) and higher than those of Mendes (2006). In the first regrowth the accumulation was lower to that obtained by Oliveira et al. (2003) and higher than those obtained by Prado et al. (2002) and Mendes et al. (2011), which were 21.9 and 31.7 kg ha^-1, respectively. For second regrowth the average accumulation was 41.03 kg ha^-1 (Table 4).

For sulfur, there was an accumulation in shoot biomass of 59.4 kg ha^-1, higher than the values reported by Tasso Júnior et al. (2007). In the first regrowth the mean accumulation was 48.6 kg ha^-1 showing a higher accumulation compared to the results of Coleti et al. (2006) and Prado et al. (2002). For second regrowth the average was 43 kg ha^-1.

Plant-cane macronutrients accumulation average in the biomass of aerial part of the varieties presented the following descending order K > N > Ca > Mg > S > P, but in the first and second regrowth the sequence observed was K > N > Ca > S > Mg > P. The macronutrients, with the exception of phosphorus and calcium, showed a tendency to reduce accumulation in shoot biomass according to the descending order of plant-cane > first regrowth > second regrowth. Gomes (2003) obtained smaller accumulations of primary macronutrients in the first regrowth cycle, followed by second regrowth and plant-cane.

There was no varietal effect for the zinc and iron accumulation in the plant-cane and first regrowth cycles (Table 5). For second regrowth, a larger accumulation of these micronutrients was observed on RB867515 variety. Tasso Junior et al. (2011) evaluated the micronutrients extraction and exportation for five sugarcane varieties and obtained a zinc accumulation ranging from 245 to 535 g ha^-1 and iron ranging from 2,700 to 4,300 g ha^-1 in Red-Yellow Oxisol. Mendes et al. (2011) evaluating the micronutrients exportation by RB92579 in a Vertisol from the Submédio São Francisco region obtained an accumulation of 362 g ha^-1 approving the results of the present study.

Foliar diagnosis studies may report if soil supply is adequate or if plants are deficient. In case of inadequately supplied corrective, efficient soil fertilization management is necessary. Copper and manganese deficiency can cause productivity potential damages, by reason of these elements participate in several oxidation-reduction reactions, especially in the photolysis of water, carbon and nitrogen metabolism (Marshner, 2012).

The average values of boron in shoot biomass of four sugarcane varieties in the plant-cane cycles, first and second regrowth, are shown in Table 7. There was a varietal effect only in the second regrowth, with RB867515 providing greater accumulation. According to Oliveira et al. (2007), for a production of 150 tons of natural material, sugarcane extracts and accumulates 8.0, 3.0, 0.6, 0.4 and 0.3 kg of iron, manganese, zinc, copper and boron in shoot biomass, respectively. During the three cultivation cycles the varieties presented the following decreasing order of extraction: Iron > Manganese > Zinc > Boron > Copper.

CONCLUSIONS

No difference was observed among the sugarcane varieties regarding stalk yield. In average the results were 126, 102 and 86 t ha^-1, respectively for plant-cane, first and second regrowth.

For nutrients accumulation, no effect was also verified for the varieties. The average accumulation of N, P, K, Ca, Mg and S during the three harvesting cycles were, respectively, 396, 63, 576, 174, 141 and 144 kg per hectare.

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Acknowledgments

To the Triunfo Mill for the logistical support during this study. To Conselho Superior de Desenvolvimento Científico e Tecnológico (CNPq) for financial support and the fellowships conceded.

Received/recebido: 2017.03.03

Received in revised form/recebido em versão revista: 2017.07.21

Accepted/aceite: 2017.08.01