圃場の大区画化における作業量の変化について （第１報）水稲，大豆作の現地調査

Abstract

The increase of field lot in size enables us to use the machinery more effectively. This effective use of the machinery leads to “SCALE MERIT”. To make the “SCALE MERIT” clear, we have investigated various kinds of field works on fields different in size, and analized the degree of effective use of the machinery which is connected with the increase of field scale. The analysis is made by calculating effective field capacity and effective field efficiency. In the analysis, we divide the total operating time of different field works into actual operating time, turning time (including moving time), loading time of seedling, seed, fertilizer, and unloading time of unhulled rice.The results are as follows:1) Actual operating time is influenced by operating conditions (operating speed and operating width). Actual operating time per 10 are changed very much where operating conditions were different. When these conditions were equal, actual operating time per 10 are was almost constant regardless of size.2) Turning time is influenced by the number of turning times. When turning times of reciprocating work and head land work were equal at any size fields respectively, turning time per 10 are was shorter as the field size became larger. But this was not true or just the opposite when we used the machinery inferior in operating conditions at large scale fields.3) Loading and unloading time per 10 are was not dependent on the field size when machine capacity and the number of supplementary members were the same.4) In the investigations into many field works, the operating conditions were sometimes different from field to field. In this case, we could not confirm by effective field capacity the realities of effective use of machinery brought by the increase of field scale. But when the operating conditions were equal, effective field capacity increased with the increase of field lot in size, and therefore the “SCALE MERIT” has been recognized.5) Even when “SCALE MERIT” was not admitted by analyzing effective field capacity, we could admit it by analyzing effective field efficiency, because effective field efficiency rose with the increase of field lot in size. So, it is found out that effective field efficiency is used as an effective method to confirm the effect of the increase of field size.