scholarly journals The Work System for the Dry Seeded Rice Culture on Clay Ill-drained Paddy Field of the Large Lot. (I) Effect of Soil Packing on Seeding.

1993 ◽  
Vol 28 (1) ◽  
pp. 19-26
Author(s):  
Yoshitada KITAKURA ◽  
Tsuneo HAYASHI ◽  
Tadatoshi IWATA ◽  
Chikara KAGOSHIMA
Keyword(s):  
Paddy Field ◽  
Rice Culture ◽  
Work System

Effect for a Paddy Weeding Robot in Wet Rice Culture

2018 ◽  
Vol 30 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Hitoshi Sori ◽  
Hiroyuki Inoue ◽  
Hiroyuki Hatta ◽  
Yasuhiro Ando ◽  
◽  
...  
Keyword(s):  
Crop Yield ◽  
Seedling Growth ◽  
Paddy Field ◽  
Rotational Speed ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Rice Seedling ◽  
Environmental Load ◽  
Rice Farming ◽  
Rice Culture

In recent years, wet rice farming that does not use chemical herbicides has come in demand owing to the diversified consumer needs, preference for pesticide-free produce, and need to reduce the environmental load. In this paper, we propose a “weeding robot” that can navigate autonomously while weeding a paddy field. The weeding robot removes the weeds by churning up the soil and inhibits the growth of the weeds by blocking-off sunlight. It has two wheels, whose rotational speed is controlled by pulse width modulation (PWM) signals. Moreover, it has capacitive touch sensors to detect the rice plants and an azimuth sensor used when turning. To demonstrate its effect in wet rice culture, we conduct a navigation experiment using the proposed weeding robot in two types of paddy field: conventional and sparse planting. The experiment results demonstrate that the proposed weeding robot is effective in its herbicidal effect, promoting the rice seedling growth and increasing the crop yield.

Natural cadmium loading and balance in a non-polluted rice paddy field in Japan

2008 ◽  
Vol 58 (11) ◽  
pp. 2243-2249 ◽  
Author(s):  
Saeko Yada ◽  
Tomohito Arao ◽  
Akira Kawasaki ◽  
Takayuki Saito ◽  
Hideyuki Nagai ◽  
...  
Keyword(s):  
Water Treatment ◽  
Irrigation Water ◽  
Paddy Field ◽  
Rice Paddy ◽  
Phosphorus Fertilizer ◽  
Cultivated Rice ◽  
Rice Culture ◽  
Rice Paddy Field ◽  
Actual Increase ◽  
Total Input

We determined the natural Cd balance in a cultivated rice paddy field in Japan. The main sources of Cd in the non-polluted paddy field were phosphorus fertilizer and precipitation (annual input of Cd, 2,000 mg ha−1 and 1,020 mg ha−1, respectively). These sources account for 95% of the total input of Cd (3,192 mg ha−1). The actual increase of Cd in the soil was 0.0016 mg kg−1, we thus consider Cd in soil increases only slightly as a result of rice culture. This study indicates that it is difficult to reduce Cd loading by irrigation water treatment in a non-polluted paddy field. This further indicates that once a field is polluted by Cd it is difficult to decrease the accumulated Cd by the ordinary cultivation of rice plants.

Work system analysis of home nursing care and implications for medication errors

2005 ◽  
Author(s):  
K. L. Calvin ◽  
Gail R. Casper ◽  
Ben-Tzion Karsh ◽  
Patricia F. Brennan ◽  
Laura J. Burke ◽  
...  
Keyword(s):  
Medication Errors ◽  
Nursing Care ◽  
System Analysis ◽  
Home Nursing ◽  
Work System ◽  
Home Nursing Care
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