Page 11 - Ilmu Tanah
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x The Chemistry and Fertility of Soils under Tropical Weeds
6.4 Effects of Continuous Cropping, 100
6.5 Effects of C and N on Soil Enzymatic Activities, 103
Key Questions, 109
Chapter 7
Effects of Tropical Weeds on Soil Potassium, 112
7.1 The Release of Potassium from Soil Minerals, 113
7.2 The Release of Potassium from Soil Organic Matters, 119
7.3 The Effects of Soil pH on Soil Potassium Release, 120
7.4 The Effects of Weeds on Soil Potassium Release, 124
Key Questions, 135
Chapter 8
Effects of Tropical Weeds on Heavy Metals, 137
8.1 The Chemistry of Heavy Metals in Soils, 138
8.2 Effects of Weed Management, 146
8.3 Effects of Forest Conversion, 148
Key Questions, 153
Chapter 9
Closing Remarks, 155
9.1 The Chemistry of Soils under Weed Management, 156
9.2 The Availabilities of Plant Nutrients under Weed Management,
158
9.3 The Uses of Effective Weeds, 158
Abdul Kadir Salam and Nanik Sriyani – 2019
