Studies on the Tillering Primordium and Tillering Bud in Rice Seedlings : (11) Effect of calcium deficiency on the development of tillering buds

[摘要] The present experiment, with the same purpose as the pretlious report, was undertaken to make clear the effects of calcium deficiency at the early growth stage on the development of tillering buds in rice seedlings by a water culture method. The results obtained are summarized as follows: 1. In the calcium-deficiency-treatment at the early growth stage, the tillering buds in each stem-nodes of the plants developed as well as control plot and tillered. But in case the period of calcium deficiency became too long, their developments were inferior. Especially, in case the PH of nutrient solution was low, this tendency was noted as remarkable. 2. These results shown above is thought to be due to the following causes; 1) All essential elements needed for the growth of rice seedlings, with the exception of CaO, are included in nutrient solution. 2) The leaf blades with the exception of those portion aflected by calcium deficiency symptons, retains the functions of a perfect leaf. 3) The amount of calcium needed for the development of tillering buds is very small when compared with those for nitrogen, phosphorus and potassium. 4) In case the period of calcium deficiency extends for a long period, the deficiency of calcium itself becomes the limiting factor. And especialy, in case the PH of nutrient solution is low, the development of tillering buds is remarkably inhibited by the double obstacles of the calcium deficiency and the low PH of nutrient solution.

[学科分类] 农业科学（综合）