AVALIAÇÃO AGRONÔMICA DE NOVOS CLONES DE Manihot esculenta Crantz NO SEGUNDO CICLO VEGETATIVO

O presente trabalho teve como objetivo avaliar as características agronômicas no segundo ciclo vegetativo de novos clones de mandioca de mesa oriundos de um programa de melhoramento, nas condições edafoclimáticas do município de Santarém, Oeste do Pará. O delineamento experimental utilizado foi em blocos casualizados com 13 tratamentos (novos clones de macaxeira) e três repetições. As parcelas foram constituídas por 10 plantas distribuídas em duas linhas de 5 metros, com espaçamento de 1,0 x 1,0 m. Os resultados obtidos denotam que a produtividade apresentou correlação significativa e positiva com a massa de raízes comerciais (r= 0,98), massa fresca da parte aérea (r= 0,61) e diâmetro médio das raízes (r= 0,63), com destaque para o clone C5 que obteve maiores rendimentos em relação a estas características, e consequentemente apresentou maior média de produtividade 44,70 t ha-1. Em relação ao tempo de cozimento das raízes, de treze clones testados, doze materiais obtiveram tempo médio de cozimento inferior a trinta minutos, sendo classificados como tempo de cozimento bom, com destaque para o clone C11, que apresentou média de 12,30 minutos. Todos os clones avaliados apresentam características agronômicas desejáveis tornando-se promissores para o mercado do município de Santarém, no baixo Amazonas. Palavras-chave: melhoramento; baixo amazonas; produtividade; mandioca de mesa. Agronomic evaluation of new Manihot esculenta Crantz clones in the second vegetative cycle ABSTRACT: The present work aimed to evaluate the agronomic characteristics in the second vegetative cycle of new macaxeira clones from a breeding program under the edaphoclimatic conditions of the municipality of Santarém, Western Pará. The experimental design was randomized blocks with 13 treatments (new clones of cassava) and three repetitions. The plots consisted of 10 plants distributed in two rows of 5 meters, with 1.0 x 1.0 m spacing. The results show that yield was significantly and positively correlated with commercial root mass (r = 0.98), fresh shoot mass (r = 0.61) and mean root diameter (r = 0.63). highlighting clone C5 that obtained higher yields in relation to these characteristics, and consequently presented higher average yield 44.70 t ha-1. Regarding the root cooking time, of thirteen clones tested, twelve materials had an average cooking time of less than thirty minutes, being classified as good cooking time, especially clone C11, which presented an average of 12.30 minutes. All evaluated clones have desirable agronomic characteristics making them promising for the lower Amazon market. Keywords: breeding; low amazons; productivity; table cassava.

Agronomic Evaluation and Physiological Quality in Triticale, under Two Production Systems in the Laguna Region

Objective: To evaluate ten triticale genotypes to assess the quality of the seeds under two production systems, with cut and without cut, in the municipalities of Matamoros (L1) and Francisco I. Madero (L2), Coahuila,Mexico.Design/Methodology/Approach: The agronomic variables evaluated were: Grain yield (GY), number of seeds per spike (NSS), spike length (SL), number of spikelets per spike (SS) and plant height (PH). Variables in the laboratory were: normal seedlings (NS), abnormal seedlings (AS), seeds without germinating (SWG), dry seedling weight (DW), plumule length (PL) and radicle length (RL). Statistical analysis was performed with the PROC ANOVA procedure, of the SAS software.Results: A higher grain yield was found for Matamoros (L1) compared to Francisco I. Madero (L2); however,for the variable number of seeds per spike it was higher in the latter (L2). For the physiological quality of seeds in L2, the highest values were in the variables normal seedlings and radicle length. In the comparison of production systems, the best response was for the system without cut in both locations; therefore, good quality triticale seed can be produced with acceptable grain yield.Study Limitations/Implications: It is necessary to describe the performance of triticale in the springsummer agricultural cycle in the central region of the country.Findings/Conclusions: The productive performance of triticale genotypes was variable depending on the production system, and there was also a different effect on the physiological quality of the harvested seed