Sugarcane cultivar RB961552 was developed by the Sugarcane Breeding Program of the Federal University of Alagoas, a member university of RIDESA. It was selected for being highly productive, responsive to fertigation and for the high leaf biomass and excellent inter-row closure. It is resistant to brown and orange rust and moderately resistant to leaf scald and smut diseases.
Keywords:
Saccharum spp.; plant breeding; cultivar description; yield potential.
| Counties of the studied plantations | No. Trials | Latitude (S) | Longitude (W) | Altitude (m asl) |
|---|---|---|---|---|
| Atalaia | 1 | 09° 26’ | 35° 57’ | 156 |
| Barra de São Miguel | 1 | 09° 47’ | 35° 59’ | 95 |
| Boca da Mata | 1 | 09º 41’ | 36º 09’ | 148 |
| Campo Alegre | 1 | 09º 47’ | 36º 11’ | 135 |
| Colônia Leopoldina | 2 | 08° 54’ | 35° 39’ | 150 |
| Coruripe | 2 | 10° 08’ | 36° 11’ | 69 |
| Maceió | 2 | 09° 28’ | 35° 44’ | 106 |
| Marechal Deodoro | 1 | 09° 43’ | 35° 57’ | 93 |
| Matriz de Camaragibe | 2 | 09° 03’ | 35° 30’ | 130 |
| Passo de Camaragibe | 3 | 09º 15’ | 35º 33’ | 15 |
| Penedo | 1 | 10° 16’ | 36° 29’ | 61 |
| São José da Laje | 1 | 08° 58’ | 36° 02’ | 358 |
| São Luiz do Quitunde | 4 | 09° 22’ | 35° 32’ | 31 |
| São Miguel dos Campos | 1 | 09° 42’ | 36° 06’ | 132 |
| Teotônio Vilela | 2 | 09° 54’ | 36° 23’ | 166 |
| Environments | Crop cycle | Cane yield (TCH) | Sugar yield (TTRSH) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Harvest‡ | RB961552 | SP79-1011 | Difference+ | % | RB961552 | SP79-1011 | Difference+ | % | |
| All environments | Plant-cane | 133.94 | 117.19 | 16.75* | 14.29 | 18.15 | 16.40 | 1.75 | 10.65 |
| First-ratoon | 121.62 | 112.41 | 9.20 | 8.19 | 17.18 | 16.35 | 0.83 | 5.06 | |
| Second-ratoon | 116.89 | 109.56 | 7.34 | 6.70 | 16.31 | 16.34 | -0.03 | -0.19 | |
| Mean | 125.34 | 113.63 | 11.71* | 10.31 | 17.36 | 16.37 | 0.99 | 6.06 | |
| Favorable environments | Plant-cane | 160.23 | 133.04 | 27.19 | 20.44 | 20.28 | 17.53 | 2.74 | 15.64 |
| First-ratoon | 137.98 | 117.88 | 20.11 | 17.06 | 21.08 | 18.87 | 2.21 | 11.70 | |
| Second-ratoon | 142.91 | 129.99 | 12.92 | 9.94 | 19.50 | 18.63 | 0.87 | 4.67 | |
| Mean | 148.53 | 129.41 | 19.12* | 14.77 | 20.42 | 18.56 | 1.86* | 10.02 | |
| Unfavorable environments | Plant-cane | 122.25 | 110.15 | 12.11 | 10.99 | 17.03 | 15.81 | 1.22 | 7.72 |
| First-ratoon | 114.34 | 109.98 | 4.36 | 3.96 | 15.11 | 15.01 | 0.10 | 0.64 | |
| Second-ratoon | 103.89 | 99.34 | 4.55 | 4.58 | 14.19 | 14.82 | -0.63 | -4.26 | |
| Mean | 110.64 | 103.62 | 7.02 | 6.77 | 15.42 | 14.98 | 0.44 | 2.94 | |
| Trait | RR961552 | SP79-1011 | Trait | RR961552 | SP79-1011 |
|---|---|---|---|---|---|
| Leaf canopy | Dense | Medium | Internode: shape | Cylindrical | Curved |
| Leaf blade: width | Broad | Medium | Internode: expression of zigzag alignment | Absent or very weak | Strong |
| Leaf blade: pubescence on margin | Absent or very sparse | Sparse | Internode: color where not exposed to sun | Yellow green | Grey yellow |
| Leaf blade: curvature | Curved tips | Straight | Internode: waxiness | Strong | Weak |
| Leaf sheath: shape of overlapping auricle | Dentoid | Transitional | Internode: depth of growth crack | Shallow | Absent or very shallow |
| Leaf sheath: size of overlapping auricle | Medium | Small | Node: growth ring color | Yellow green | Grey orange |
| Leaf sheath: color of dewlap | Green purple | Purple | Node: width of root band | Medium | Narrow |
| Cane top: shape of cross-section | Ovate | Circular | Node: shape of bud, excluding wings | Ovate | Obovate |
| Cane top: length | Medium | Short | Node: position of the pubescence on the bud | Lateral | Apical |
| Cane top: color | Yellow green | Grey purple | Node: position of bud tip in relation to growth ring | Clearly below | Clearly above |
| Cane top: waxiness | Weak | Medium | Node: bud cushion (space between base of bud and leaf scar) | Narrow | Absent or very narrow |
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