問題一覧
1
Hydrogen ion concentration
2
Soil PH
3
7.0
4
Less than 7.0
5
More than 7.0
6
Equal to 7.0
7
Iron and aluminum
8
Low pH
9
Biotic factors
10
Plants
11
Demand for nutrients, moisture and sunlight, particularly when they are in short supply, or when plants are closely spaced
12
Synergistic effect
13
Soil fauna
14
Insects and nematodes
15
Honeybees and wasps
16
Burrowing earthworm
17
Grazing
18
Topography
19
Topographic factors
20
Altitude
21
Steepness of slope
22
Exposure to light and wind
23
Socioeconomic factors
24
Socioeconomic factors
25
Socioeconomic factors
26
Economic condition
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13問 • 1年前問題一覧
1
Hydrogen ion concentration
2
Soil PH
3
7.0
4
Less than 7.0
5
More than 7.0
6
Equal to 7.0
7
Iron and aluminum
8
Low pH
9
Biotic factors
10
Plants
11
Demand for nutrients, moisture and sunlight, particularly when they are in short supply, or when plants are closely spaced
12
Synergistic effect
13
Soil fauna
14
Insects and nematodes
15
Honeybees and wasps
16
Burrowing earthworm
17
Grazing
18
Topography
19
Topographic factors
20
Altitude
21
Steepness of slope
22
Exposure to light and wind
23
Socioeconomic factors
24
Socioeconomic factors
25
Socioeconomic factors
26
Economic condition