Correlation between certain morphological features and yield of fodder corn variety Wigor, with distance between rows, number of plants in one hole and seeding dates
Rocz Nauk Rolniczych Ser A Roslinna 87(4): 749-785
The seeding was done in loess soil following sugar beets. Fertilizers were applied before seeding at the following rates of pure components per ha: 61.5 kg N in 20.5% nitro-chalk; 120.0 kg K2O in 40% potash-salt; 48.0 kg P2O5 in 16% superphosphate. Seeding dates were May 10 and 20 in 1955, and May 12 and 22 1956. Distance between rows was 40 X 30 cm-80 X 60 cm and number of plants per hole 1-5. The variety "Wigor" was taller in 1955 because of favorable weather conditions. The distance between rows and number of plants per hill only slightly influenced the difference in height. The plants were somewhat taller if more numerous in one hole. Time of seeding date had no distinct influence on height. In 1955 first seeding plants were slightly taller than those from the second date. In 1956, some individuals from the second seeding overshot plants sown earlier. Seeding dates and density of sowing did not influence the number of cobs per plant. In 1956 the cobs were placed lower than in 1955. Earlier sown maize firmed cobs lower than those sown later. Density of seeding did not influence the point of cob formation on the plants. Cobs were longer in 1955 than in 1956. Neither seeding date nor distance between rows and number of plants per hill influenced the length of the cob. The circumference of the cobs, measured at half their length, was greater in 1955 that of 1956. Seeding dates and density were of no significance in the difference. The number of corn rows per cob was markedly higher in 1955 than in 1956, but seeding dates and distance between rows did not influence this feature. The weight of the cobs, corn and stalk with jacket in 1955 was twice that in 1956. Seeding dates again had no influence. Distance between rows being the same, the weight of cobs, corn, stalk and jacket increased with the number of plants per hill. Seeds reaped in 1955 were far heavier than those gathered in 1956. The density of seeding in the experiments of both years did not result in any marked difference in the weight of 1000 grains. Corn from the second seeding date in 1956 was actually heavier than that from the first date. Seeding dates in 1955 did not influence the weight of corn. Crops of cobs and straw were higher in 1955 than in 1956. In both these years, no essential influence of seeding dates on crop could be ascertained. The highest crops of were obtained at a distance between rows of 40 X 40 cm, and with 2 plants per hill. This gave the highest number of plants per ha., whereas the lowest yield was obtained with a distance between rows of 80 cm X 60 cm and 3 plants per hill. A larger content of water in the corn was observed in maize with a later seeding date and a larger number of plants per hill. The corn from the first seeding date was more often smut infected than that from the second seeding. Smut increased in proportion to the density of plants.