Yield and technological quality of sugarcane under irrigation depths and nitrogen fertilization/Produtividade e qualidade tecnologica da cana-de-acucar sob laminas de irrigacao e adubacao nitrogenada

The objective of this study was to evaluate the stalk yield, sugar yield and technological quality of two varieties of sugarcane under different irrigation depths and nitrogen doses. The experiment was conducted in two consecutive years (2015 and 2016) at Olho D'Agua Farm, in Itambe, Pernambuco...

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Published in:Revista brasileira de engenharia agrícola e ambiental 2020-07, Vol.24 (7), p.482
Main Authors: Mendoca, Marcos F. de, Neto, Jose Dantas, Silva, Patricia F. da, Oliveira, Emidio C.A. de
Format: Article
Language:English
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Summary:The objective of this study was to evaluate the stalk yield, sugar yield and technological quality of two varieties of sugarcane under different irrigation depths and nitrogen doses. The experiment was conducted in two consecutive years (2015 and 2016) at Olho D'Agua Farm, in Itambe, Pernambuco, Brazil. The experimental design was randomized blocks in the split-split-strip-plot scheme, with four replicates. Treatments consisted of four irrigation depths (L1 = 12, L2 = 45, L3 = 100 and L4 = 125% of the crop evapotranspiration - ETc, plant cane) and (L1 = 10, L2 = 40, L3 = 100 and L4 = 125% ETc, ratoon cane), four doses of nitrogen (N1 = 0, N2 = 50, N3 = 100 and N4 = 200 kg [ha.sup.-1] of N) and two varieties of sugarcane (RB92579 and RB002754). Sugarcane plants irrigated with the highest depths of 1,324.06 and 1,242.3 mm in the plant cane and ratoon cane cycles respectively produced 38.40 and 49.14 t of stalks [ha.sup.1] and 0.48 and 1.82 t of sugar [ha.sup.1] more, compared to those irrigated with the lowest depths of 124.06 and 99.4 mm. The highest stalk yield was obtained with the combination of 120.7 kg [ha.sup.1] of N and 1266.6 mm of irrigation depth. Sugarcane technological quality is positively correlated with the increase of the irrigation depth in the plant cane and ratoon cane cycles and negatively correlated with nitrogen. Key words: crop evapotranspiration, effective precipitation, ammonium nitrate, sucrose Objetivou-se com este estudo avaliar a produtividade do colmo, do aciicar e a qualidade tecnologica de duas variedades de cana-de-acucar sob diferentes laminas de irrigacao e doses de nitrogenio. O experimento foi conduzido em dois anos consecutivos (2015 e 2016) na Fazenda Olho D'Agua, em Itambe, Pernambuco. O delineamento experimental foi em blocos casualizados no esquema de faixas subsubdivididas, com quatro repeticoes. Os tratamentos foram constituidos de quatro laminas de irrigacao (L1 = 12, L2 = 45, L3 = 100 e L4 = 125% da evapotranspiracao da cultura - ETc, cana planta) e (L1 = 10, L2 = 40, L3 = 100 e L4 = 125% de ETc, cana soca), quatro doses de nitrogenio (N1 = 0, N2 = 50, N3 = 100 e N4 = 200 kg [ha.sup.1] de N) e duas variedades de cana-de-acucar (RB92579 e RB002754). A cana-de-aciicar irrigada com as maiores laminas de 1.324,06 e 1.242,3 mm na cana planta e na cana soca produziu, respectivamente, 38,40 e 49,141 de colmo [ha.sup.-1] e 0,48 e 1,821 de aciicar [ha.sup.-1] a mais em comparacao a irrigada com as menores laminas de 124,
ISSN:1415-4366
1807-1929
DOI:10.1590/1807-1929/agriambi.v24n7p482-489