Tiller Type Research Articles

Feasibility of Hybrid Rice1

Two rice varieties, representing a low tillering type and a profuse tillering type, were direct‐seeded and transplanted at seven plant densities to determine the effect of planting method and plant population on yield. Three year's results show that transplanted rice was more productive than direct‐seeded rice at all population densities with yields leveling off at 100 plants/m2 plant density. At all population densities the profuse tillering type was nmre productive than the low tillering type. With the developmem: of a cytoplasmic male‐sterile, the high cost of seed could be minimized by using low population rates without yield reductions. The greatest potential for F1 hybrids appears to be in the transplanted rice areas of the world.Segregating ratios from two sources of sterility could be explained by a single pair of recessive genes controlling sterility with one or more modifiers influencing the action. After a cytoplasmic male‐sterile has been developed it appears cross‐pollination will be the limiting factor in F1 hybrid seed production.

Analysis of the man-tiller system

A Japanese tiller operated by a walking farmer was studies ergonomically. Gear and main clutch levers were revealed to be located too far from the operator.The clutch lever attached to the handle-bar should also be improved. Heart rate of the trained operators during the straight driving of the tiller was about 90-100beats/min. Heart rate increase was more conspicuous in turning the machine, as the operator had to lift the handle-bars to let the rotating plough free from the ground. Variation of flicker fusion frequency was tmall, but arm tremor became large after the tillege. Noise. level during the operation was as high as 90-93 phones. Varioues. types of tillers were compared and thier improvement especially as to the turning operation was discussed.

The Effect of Irregular Disposition of Rice Plant on Yield in Direct Sowing Culture

The experiment was performed to find out the effect of irregular disposition of drill-seeded rice plants upon yield in direct sowing culture. Row of 1 m length was divided into ten equal sections (10 cm row) and number of plants in them was varied. Co-efficient of variation (cv) of number of plants in 10 cm row was used as the index of irregular disposition and five plots of cv 0 %, 30 %, 60 %, 100 %, and 150 %, were established. 1. The more irregular disposition of plants was, the more decrease in grain weight (per unit area) was. It's degree was more remarkable in Fujiminori (early maturing and panicle type variety) than in Manryo (medium maturing and medium tiller type variety). 2. Decrease of grain weight was caused by that of number of panicles (per unit area). In Fujiminori, number of panicles decreased according as irregularity in disposition of plants increased. grain weight per panicle being remained unchanged. Therefore grain weight decreased in proportion to increase in irregularity of plant disposition. In Manryo, however, grain weight per panicle increased though number of panicles decreased. Accordingly decrease of grain weight compared with the plot of cv 0 % was not observed in plots of cv 30∼100 %. 3. In Fujiminori, decrease of grain weight with irregular disposition of plants was more marked in the case of low seeding density than in that of high one. In Manryo, however, the difference of the effect of irregular disposition on grain weight caused by different spacing densities was not clear.

On the Soil Pressure under Tiller Type Garden Tractor Loads during Pull

On the Soil Pressure under Tiller Type Garden Tractor Loads during Pull

Study on the Wheels of the Small Garden Tractor (Tiller Type) (No. 1)

Study on the Wheels of the Small Garden Tractor (Tiller Type) (No. 1)