Growth dynamics and optimal harvesting stage of two forage maize varieties

Journal: Agricultural sciences in china. 2011, 10:220-227

Author: Fu feng-ling, guo chang-jun, tang qi-lin, liu jian, li wan-chen

Abstract:

SAUMZ 1 and SAUMZ 2 are twoforagemaizevarieties reproduced by distant hybridization. In a randomized block experiment, their fresh forage yield and dry matter yield were investigated on the basis of growth period, leaf stage, and effective accumulated temperature. The nutritional components were measured in a near infrared diffuse reflectance spectroscopy. Referring to the concept of forage grading index, a formula was constructed to calculate the total digestible energy. The investigated characters and indexes were adapted to suitable models of growthdynamics. The results showed that these twovarieties have strong heterosis in fresh forage yield, dry matter yield, and total digestible energy. Their growthdynamics were adapted to Logistic models described by general equationy=k/(1+ae?bx). The forage grading indexes of these twovarieties were decreased linearly along with the increasing of their leaf stage. The stopping point of fast growing period of total digestible energy estimated on the basis of leaf stage was suggested to be used as optimalharvestingstage of foragemaize. The optimalharvestingstage was estimated to be tasseling stage for SAUMZ 1 and 19.50-leaf stage for SAUMZ 2.

Link: http://www.sciencedirect.com/science/article/pii/S1671292709603084