Alternativas para favorecer la polinización y producción de semilla del híbrido H-311 de maíz

Alejandro Espinosa, Margarita Tadeo, Hortencia Medina, José Ricardo Gutiérrez, Maximino Luna
2006 Agronomía Mesoamericana  
For corn hybrid production it is fundamental that progenitors' flowering coincide and that the availability of stigma with respect to tassels. The H-311 hybrid is recommended for irrigated, at altitudes between 1200 and 1800 meters above sea level. The initial cross order was: (B16XB17) X (B32XB33); however, the order was reversed, that is (B32XB33) X (B16XB17), due to a higher productivity and seed quality. The B16XB17 is dwarf (braquitic), and during pollination under insufficient wind,
more » ... ficient wind, breeding is difficult and it is necessary to use motorized knapsacks to rise pollen, the simple cross B16XB17, yields from 4.5 to 5.5 t/ha of seed, compared to 6.0 to 7.5 t/ha of the simple cross B32XB33; The simple cross B16XB17, responds with increased height with the treatment with giberelic acid (Activol), at 20, 40 and 60 ppm, two applications of Meqiquat Chloride (PIX), 1 and 2 l/ha, as well as three fertilizer levels (400-70-30, 150-70-30 y 150-300- 30). There was a yield effect due to management of both progenitors with different fertilizer levels, as well as with the use of fitohormones, with the application of giberelic acid (20 ppm), the yield increased 250.3%and 211.8% for the simple crosses B32XB33 y B16XB17, respectively. The plant height of B16XB17 was slightly affected (106% with 40 ppm of giberelic acid).
doi:10.15517/am.v12i2.17239 fatcat:vr72t4oswbefhedbq2vjyydlj4