Discer seed spout evaluation
Authors: Wiens, E.H.
Description: The discer is widely used in Western Canada for the seeding of cereal grains. It is capable of performing an adequate seeding operation in both summer fallow and stubble, without prior tillage, contrary to some of the other seeding machines presently in use (1). The placement of seed in an optimum location in the soil to obtain the best germination, and consequently the highest yield, varies with the type of seeder used (2, 3). From observations of seeded crops, it is evident that discer seeding results in the seed being scattered, whereas drill seeding results in the crop emerging in neat rows. The assumption usually made is that the optimum location for seed is in the furrow bottom, with the furrow bottom being at such a depth that adequate moisture for germination is available. In an attempt to determine the degree of seed scatter experienced in discer seeding, the effect of seed spout design (shape, size of outlet, etc.) on seed scatter was studied. The study evaluated seed spouts obtained from six major discer manufacturers. In addition, the velocity and trajectory of wheat kernels leaving the seed spouts were determined to ascertain the best location of the spouts with respect to the disc, so that the kernels would be placed in the furrow bottom. The kernel velocities and trajectories, in conjunction with the location of the seed spouts with respect to the disc on production models of six discers, were used to determine the theoretical placement of seed in the furrow bottom.
Keywords: discer seed spout evaluation
Citation: Wiens, E.H. 1973. DISCER SEED SPOUT EVALUATION. Canadian Agricultural Engineering 15(2):66-70.
Start page number: 66
End page number: 70