Stalk and sucrose yield in response to nitrogen fertilization of sugarcane under reduced tillage

Pesquisa Agropecuária Brasileira

Caio Fortes²  Paulo César Ocheuze Trivelin²  André César Vitti¹  Rafael Otto¹  Henrique Coutinho Junqueira Franco¹  Carlos Eduardo Faroni¹ 

[1] ,Universidade de São Paulo Centro de Energia Nuclear na Agricultura Piracicaba SP ,Brazil

关键词: Saccharum;    agroindustrial production;    biomass;    crop residues;    subsoiling;    unburned cane;    Saccharum;    produtividade agroindustrial;    biomassa;    resíduos culturais;    subsolagem;    cana crua;   

DOI  :  10.1590/S0100-204X2013000100012

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the agroindustrial production of sugarcane (millable stalks and sucrose yield) after successive nitrogen fertilizations of plant cane and ratoons in a reduced tillage system. The experiment was carried out at Jaboticabal, SP, Brazil, on a Rhodic Eutrustox soil, during four consecutive crop cycles (March 2005 to July 2009). Plant cane treatments consisted of N-urea levels (control, 40, 80, and 120 kg ha-1 N + 120 kg ha-1 P2O5 and K2O in furrow application). In the first and second ratoons, the plant cane plots were subdivided in N-ammonium nitrate treatments (control, 50, 100, and 150 kg ha-1 N + 150 kg ha-1 K2O as top dressing over rows). In the third ratoon, N fertilization was leveled to 100 kg ha-1 in all plots, including controls, to detect residual effects of previous fertilizations on the last crop's cycle. Sugarcane ratoon was mechanically harvested. A weighing truck was used to evaluate stalk yield (TCH), and samples were collected in the field for analysis of sugar content (TSH). Increasing N doses and meteorological conditions promote significant responses in TCH and TSH in cane plant and ratoons, in the average and accumulated yield of the consecutive crop cycles.

【 授权许可】

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