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Presidente Prudente, Brazil

Marques T.A.,CENTEC UNOESTE | dos Santos A.T.,CENTEC UNOESTE | Marques P.A.A.,University of Sao Paulo
IRRIGA | Year: 2013

In order to provide the rational use of water in agriculture hydrogel polymers can be used. The aim of the present study was to indentify the interference of hydrogel polymers and different plantation depth (furrow and windrow) on biometrics parameters, final productivity and industrial quality attributes of sugarcane. The variables used were: biometrics parameters during the vegetative growth stage, and the final yield and technological quality of sugarcane, in two production cycles. The experiment was conducted in the city of Presidente Prudente, state of São Paulo, Brazil, with the RB 86 7515 sugarcane variety being planted in December 2007 and harvested in June 2009 (first harvest - 18 months) and in July 2010 (ratoon cane - 12 months). For the two cycles were used a randomized block design with two blocks (planting in the furrow and windrow) and with four treatments (0; 26.67; 53.33 and 80.00 kg of polymer per hectare) with eight repetitions. The hydrogel polymer modified the biometric, increasing the tillering and providing higher productivity in sugarcane plant. Besides, it caused the smallest decrease in sugarcane ratoon crop yield and showed to have a correlation with the total recovered sugar of sugarcane. With higher doses of hydrogel polymer the windrow planting system presented lower decrease in productivity and higher tillering. Source

The mechanized harvesting is best performed in shallow furrows. The straw promotes greater retention of water, reduces evaporation from the surface, but affects the budding. The polymers modify the physiology providing water and nutrients. The objective of this study was to understand the relationship of form of planting, straw and polymers with bioenergy (of the stalk, straw and system), productivity (stalks, straw and biomass), fiber and total recoverable sugar (TRS). The sugarcane ratoon has been used in plots (2 x 4), that is, two depths and four doses of the polymer. The plots were subdivided into treatments with four doses of dry matter and three repetitions. The use of dose of 5 t ha-1 as top dressing was detrimental to the productivity of sugarcane, biomass and bioenergy. The form of planting and the use of polymer did not affect the studied variables. There is a linear relationship between productivity and bioenergy stalk, straw and bioenergy productivity of trash. The bioenergy system has a linear relationship with biomass, fiber and TRS. The bioenergy is divided into 82.6% in stalk and 17.4% in straw. Source

Marques T.A.,CENTEC UNOESTE | Marques P.A.A.,University of Sao Paulo | Suriani M.W.,CENTEC UNOESTE | Dos Santos A.T.,CENTEC UNOESTE | Mendonca F.C.,University of Sao Paulo
Engenharia Agricola | Year: 2013

The water absorbent polymer effect on vegetative growth and production of Theoretical Recovery Sugar (TRS) of sugarcane cv. RB 86 7515 was evaluated on two field tests installed in randomized blocks, with four treatments and five repetitions. The polymer doses were 0; 4; 8 and 12 g m-1 of furrow (test 1) and 0; 1.4; 2.8 and 4.2 g m-1 of furrow (test 2). Test 1 (dec/2007 to may/2009) was implanted in a Distroferric Red Argisol soil in Presidente Prudente - State of São Paulo (SP), Brazil; and the test 2 (Aug/2008 to Aug/2009) was implanted in a Red Yellow Argisol soil in Lucélia - State of São Paulo (SP), Brazil. In test 2, there were no significant differences for any evaluated parameters. In both tests the polymer doses equal to or less than 4 g m-1 of furrow showed no significant effect on the evaluated parameters. In test 1, the polymer doses of 8 and 12 g m-1 of the conditioning polymer increased the number of tillers in stage II of development and led to the largest amount of straw. The gross income per hectare has positive relation with the polymer doses. The polymer had no significant effect on the sugarcane stems productivity and technological parameters. Source

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