Studies on fractional application of nitrogenous fertilizers in vegetable crops. III

Abstract

Effects of fractional application of nitrogenous fertilizers, ammonium sulfate, ammonium nitrate, and rape cake, on vine growth, blossom number and yield of cucumber were tested in 1954. Am-monium and nitrate nitrogen contents in the soil and nitrogen contents in the plant were periodically analyzed. 1. In the experimental plots of ammonium sul-fate, ammonium and nitrate contents in the soil were maintained at relatively higher level until the later part of the growing season. The best vine growth, largest number of blossoms, and the high-est yield of cucumber were obtained where every fifth was applied in five times, and the lowest was in the treatment where total amount of the ferti-lizer was applied at the time of planting. 2. In the ammonium nitrate plots, effects were nearly the same as in the ammonium sulfate plot; i.e. the highest growth was in the plot every fifth were applied in five times and the lowest were in the treatment where total amount of the fertilizer was applied at the time of planting. But growth and yield were less in general as compared with the plot recieved the other fertilizers. 3. In the rape cake plots, less difference was observed among the methods of application of the fertilizer. The highest yield of cucumber was ob-tained where total amount of the fertilizer was applied at the planting time, or every half amount of the fertilizer was applied twice than the plots where the fertilizer was fractionally applied in several times.