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poster - International Conference of Agricultural Engineering

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40 mm 65.30 59.00 8.70 8.10<br />

60 mm 67.60 63.40 9.40 9.20<br />

80 mm 78.10 63.30 10.70 9.10<br />

Average 64.28 a 57.83 b 8.74 a 8.12 a<br />

DMS 5,16 0,84<br />

CV% 11,02 13,06<br />

* Means followed by same letter are not statistically different from each other. We used the Tukey test at 5%<br />

probability<br />

These results are in agreement with the results found by Inman-Bamber (2004). This<br />

author explains that the water deficit negatively affects the growth <strong>of</strong> shoots <strong>of</strong> sugarcane,<br />

especially leaf production, accelerating senescence and plant as a whole, and may also lead<br />

to a reduction in radiation interception, the efficiency <strong>of</strong> use <strong>of</strong> water and photosynthesis, as<br />

well as increased radiation transmitted to the soil surface.<br />

Despite the statistical analysis show that there was no interaction between the effects<br />

<strong>of</strong> mulch and irrigation water used (Table 1), the results in Table 5 show the highest yield <strong>of</strong><br />

cane and sugar when the variety SP79-1011 was cultivated under mulch.<br />

In Table 3 are the data on the number <strong>of</strong> stems per meter and stem height. No differences<br />

were seen between the number <strong>of</strong> stems per meter when subjected to the effect <strong>of</strong> mulch.<br />

Furthermore, results shows that significant effects <strong>of</strong> plant height when the plants were<br />

subjected to increasing irrigation levels. Showing that water deficit influences significantly the<br />

height <strong>of</strong> the stems and consequently productivity. According to some authors, such as<br />

Inman-Bamber (2004) and Silva et al. (2008), the variation in plant height is an indicator <strong>of</strong><br />

tolerance or susceptibility <strong>of</strong> cane sugar to water deficit. For this case, the increase in<br />

irrigation promoted an increase in stem height. The results also agree with Dantas Neto<br />

(2006), who reported that irrigation water influence <strong>of</strong> linear and quadratic growth parameters<br />

and production <strong>of</strong> sugar cane in the variety SP79-1011.<br />

TABLE 3. Mean number <strong>of</strong> stems per meter and stem height (m) for irrigation applied.<br />

Nº <strong>of</strong> Stems /m Heigth (m)<br />

Treatment With organic<br />

mulch<br />

Without organic<br />

mulch<br />

With organic<br />

mulch<br />

Without<br />

organic mulch<br />

No irrigated 11.30 10.40 124.78 122.00<br />

20 mm 11.10 11.20 134.56 146.44<br />

40 mm 10.80 11.20 151.67 153.56<br />

60 mm 10.50 11.30 152.89 162.78<br />

80 mm 12.00 11.40 159.33 160.56<br />

Average 11.16 a 11.11 a 144.64 a 149.07 a<br />

STD 0.48 6.51<br />

CV% 5.64 5.78<br />

* Means followed by same letter are not statistically different from each other. We used the Tukey test at 5%<br />

probability.<br />

.<br />

The data relating to the stem diameter and weight <strong>of</strong> stems are in Table 4. Increased<br />

irrigation did not cause an increase in stem diameter. There was a decrease the stem<br />

diameter with increasing water depth. Moreover, the results showed a significant difference<br />

in the diameter <strong>of</strong> stem. The stem diameters <strong>of</strong> plants evaluated were higher in the mulch.<br />

This increase in diameter <strong>of</strong> stems in the presence <strong>of</strong> mulch match those obtained by<br />

Thompson & Wood (1967). The weight <strong>of</strong> the stems was greater with the increase in the<br />

irrigation water (Table 6) and in the presence <strong>of</strong> the mulch (Table 4).<br />

TABLE 4. Stem diameter <strong>of</strong> cane sugar (cm) and weight <strong>of</strong> stems (kg / stem) as a function <strong>of</strong><br />

irrigation levels applied, in areas with and without mulch in Pirinopolis-GO, Brazil.<br />

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