poster - International Conference of Agricultural Engineering

Table 1 - Analysis of variance for content of sucrose (%), soluble solids content (Brix) and total
recoverable sugar (TRS, Kg Mg -1 ) of sugarcane, during four cycles in Guaíra-SP, Brazil.
Content of sucrose (%) Brix TRS (Kg Mg -1 )
Treatments
Cycle
1 st 2 nd 3 th 4 th 1 st 2 nd 3 th 4 th 1 st 2 nd 3 th 4 th
T1NI 16,3 14,2 15,6 18,8 19,6 b 17,4 18,1 21,2 143 126 136 159,5
T2I 16,7 14,6 16,3 17,8 20,8 a 17,3 18,8 20,4 147 129 141 152,2
T3Iv 16,5 14,3 16,5 17,7 19,9 ab 17,3 18,9 20,1 144 127 143 150,7
T4IV 17,5 13,6 16,7 18,3 20,9 a 16,6 19,0 20,8 153 123 144 155,7
Test F 1,2 ns 1,6 ns 1,0 ns 1,0 ns 4,5* 0,5 ns 0,5 ns 0,7 ns 1,6 ns 1,4 ns 1,1 ns 1,3 ns
C.V. (%) 6,6 5,3 7,3 6,0 3,3 4,9 5,4 4,99 5,0 4,1 5,9 4,9
* Significant at 10% of probability; ** Significant at 5% of probability by Duncan’s test; ns – non significant; C.V. =
Coefficient of variation. T1NI - non irrigated with mineral fertilization of NPK; T2I - irrigated by SDI and application
of NPK by fertigation; T3Iv - irrigated by SDI and fertigation with vinasse, supplying the K; T4IV - irrigated by SDI
and fertigation with vinasse, supplying the NK.
As observed for the sucrose content of juice, there was no effect of treatment on the total
recoverable sugar (TRS) in the four crop cycles. The information about content of sucrose in
the juice and TRS (Table 1) allow us to state that the water applied through SDI, with a
stopped 45 days before harvest, did not provided deleterious effect on the quality of the juice
when compared to cultivation non-irrigated, reporting that the usage of irrigation and
application of vinasse via subsurface drip until the fourth sugarcane cycle, does not affect the
maturation of the culture.
In the first cycle, the stem yield was significantly affected (p> 0.05) by the use of SDI and
fertigation, with the dose of vinasse supplying the K (T3Iv), this treatment had the highest
stem yield when compared to rainfed cultivation (T1NI), the average production of stem
obtained by T3Iv was higher by 16.6 Mg ha-1 obtained in the T1NI (Table 2).
Table 2 - Analysis of variance for Stem yield (Mg ha -1 ) and Sugar yield (Kg Mg -1 ), during four cycles of
sugarcane in Guaíra-SP, Brazil.
Stem yield (Mg ha -1 ) Sugar yield (Kg Mg -1 )
Treatments
Cycle
1 st 2 nd 3 th 4 th Total 1 st 2 nd 3 th 4 th Total
T1NI 215 a 173 160 a 140 a 684 a 31 a 21 22 b 22 96 a
T2I 225 ab 165 166 ab 151 b 708 ab 33 ab 21 24 ab 23 101 ab
T3Iv 231 b 167 175 ab 151 b 724 b 33 ab 21 25 a 23 102 b
T4IV 224 ab 172 180 b 149 ab 724 b 34 b 21 26 a 23 104 b
Teste F 2,91* 0,52 ns 3,32* 2,35* 4,54 3,16* 0,04 ns 5,17** 0,23 ns 0,21
C.V. (%) 4,46 4,46 4,46 4,94 3,50 6,76 6,68 7,11 9,64 3,81
* Significant at 10% of probability; ** Significant at 5% of probability by Duncan’s test; ns – non significant; C.V. =
Coefficient of variation. T1NI - non irrigated with mineral fertilization of NPK; T2I - irrigated by SDI and application
of NPK by fertigation; T3Iv - irrigated by SDI and fertigation with vinasse, supplying the K; T4IV - irrigated by SDI
and fertigation with vinasse, supplying the NK..
The stem yield in the second cycle of cultivation with sugarcane, did not differ significantly
among treatments, as shown in Table 2. The precipitations that occurred during the
development of culture in the second, (Figure 1) provided a good water supply in soil,
providing favorable conditions for plants grown without irrigation. In the third crop cycle, the
effect of treatments was significant, with the treatment T4IV different from the treatment
without irrigation. The stem yield T4IV treatment was 20 Mg ha-1 higher than the yield
obtained by the treatment T1NI. The treatment T4IV did not differ in the amounts of stem
yield when compared to treatments T2I and T3Iv.
For the stems yield in the fourth crop cycle had a significant effect (Table 2). Treatments T2I
and T3Iv produced more stem with increased production of 11.1 and 10.6 Mg ha-1,