Os 25 clones mais promissores obtidos em programa de melhoramento da cana-de-açúcar do Instituto Agronômico, iniciado em 1969, foram testados em três experimentos efetuados em regiões canavieiras do Estado de São Paulo. A instalação dos ensaios deu-se em 1977 e, como testemunhas, utilizaram-se as variedades comerciais IAC51-205, IAC52-150, IAC58-480 NA56-79 e CB41-76. Colheram-se cana-planta, soca e ressoca nos três experimentos, sendo as médias das três colheitas utilizadas para as análises estatísticas. Os clones 69-362 e 69-326 não diferiram da melhor testemunha em produção de cana, a IAC51-205. Nessa característica, os clones 69-426, 69-425, 69-274, 69-84, 69-87 e 69-242 tiveram desempenho semelhante ao da NA56-79, segunda melhor testemunha. No teor de açúcar, destacaram-se os clones 69-309, 69-242. 69-232 e 69-362, com médias elevadas, e ainda 69-238, 69-274, 69-218, 69-254, 69-190, 69-420 e 69-277, nenhum deles diferindo da melhor testemunha, a NA56-79. Os clones 69-362, 69-242 e 69-274 tiveram comportamento semelhante ao das melhores testemunhas, no tocante à produção de açúcar por área, que foram IAC51-205 e NA56-79. Desta última, também não diferiu o clone 69-426. Foram considerados como novas variedades os clones IAC69-242, IAC69-274, IAC69-309, IAC69-362, IAC-69-425 e IAC69-426.

The best twenty five clones, obtained in a sugar cane breeding program of "Instituto Agronômico de Campinas" started in 1969, were evaluated in a series of three experiments carried out at sugar cane regions of Sao Paulo State, Brazil. In 1977 started the field trials using as controls the following commercial varieties: IAC51205, IAC52-150, IAC58-480, NA56-79, and CB41-76. The experimental design used was a randomized complete block with four replications. Three harvests were made consecutivelly in plant cane (18 months), first ratoon (12 months after), and second ratoon (12 months after). Means of the three harvest were analyzed statistically and Tukey's test procedure was used to test differences among treatment means. The cane yield results showed that clones 69-362 and 69-326 were not statistically different from the best control IAC51-205, and clones 69-426, 69-425, 69-274, 69-84, 69-87 and 69-242 showed cane yield results equal to the second best control NA56-79. Clones 69-309, 69-242, 69-232 and 69-362 had an outstanding performance in sugar content; on the other hand, clones 69-238, 69-274, 69-218, 69-254, 69-190. 69-420 and 69-277 had sugar content similar to that of best control NA56-79. Considering sugar yield, clones 69-362, 69-242, and 69-274 were not statistically different from the two best controls IAC51-205 and NA56-79, besides the clone 69-426 that showed to be equal to NA56-79, in this, characteristic. According to the results new varieties are presented: IAC69-242, IAC69-274, IAC69-309, IAC69-362, IAC69-425 and IAC69-426.

Uma série de clones obtidos em programas de melhoramento iniciado em 1967, no Instituto Agronômico, foi testada em quatro experimentos conduzidos em terras das diversas regiões canavieiras paulistas. No trabalho, iniciado em 1974, usando como testemunhas as variedades comerciais 'IAC 52-150', 'IAC 52-326', 'IAC 58-480', 'CB 41-76' e 'NA 56-79', foram feitas três colheitas em cada experimento: cana-planta, soca e ressoca, sendo as análises estatísticas executadas com as médias das três. Os clones 67-112, 67-48, 67-145 e 67-122 tiveram produção de cana superior à das testemunhas; os clones 67-19, 67-6, 67-14, 67-28, 67-21 e 67-7 não diferiram da melhor testemunha, a 'IAC 58-480', nessa característica. O clone 67-139 apresentou teor de açúcar superior ao de todos os tratamentos; o 67-55 teve teor de açúcar semelhante ao das três melhores testemunhas. Em produção de açúcar por área, o clone 67-112 foi superior a todos os outros tratamentos, com exceção do 67-122. Este último, juntamente com o 67-48, 67-12, 67-47 e 67-145, não diferiu das três melhores testemunhas nessa característica. Os clones 67-12, 67-47, 67-48, 67-55, 67-112, 67-122 e 67-139 foram considerados novas variedades, recebendo o prefixo IAC.

A lot of sugarcane clones obtained out of a breeding program started in 1967 was tested in a series of experiments. The experiments were carried out at the IAC Experiment Station, at Piracicaba, on a Ortho Dark Red Latosol soil, and in the property of the mills: Santa Elisa (Sertãozinho, Dusky Red Latosol), Itaiquara (Tapiratiba, Humic Red-Yellow Latosol soil) and Catanduva (Ariranha, Podzolized soils on calcareous sandstone, Marilia variation). The field trials started in 1974, and the commercial varieties 'IAC 52-150', 'IAC 52-326', 'IAC 58-480', 'CB. 41-76' and 'NA 56-79' were used as controls, as they represent about 70% of the sugarcane area in the São Paulo State, Brazil. Three harvests were done consecutively in plant cane (18 months), first ratoon (12 months after) and second ratoon (12 months). Statistical analysis were made in a three harvest mean for all experiments. It was found out that clones 67-112, 67-48, 67-145 and 67-122 had a cane yield superior to that of the controls. Clones 67-19, 67-6, 67-14, 67-28, 67-21 and 67-7 were not statistically different from the best control, 'IAC 58-480'. Clone 67-139 had a sugar content superior to the all the other treatments. On the other hand, clone 67-55 had a sugar content similar to that of the three best controls. In sugar yield, clone 67-112 was superior to all the other treatments, except 67-122. This one, as well as clones 67-48, 67-12, 67-47 and 67-145 were not different from the three best controls. Clones 67-12, 67-47, 67-48, 67-55, 67-112, 67-122 and 67-139 were considered as new varieties, receiving the prefix IAC.