Hydroponics 182 Nutrient film culture 35 Fertilizers 29 Tomatoes 17 Growth 13 Vegetables 13 Bok choy 11 more ... Brassica 10 Gardening 10 Kale 10 Lettuce 10 Vegetables, Chinese 8 Congresses 7 Nutrition 6 Plants 6 Trickle irrigation 6 Yield 6 Breeding 5 Organic fertilizers 5 Peppers 5 Plant-water relationships 5 Food crops 4 Spinach 4 Aquaculture 3 Bibliography 3 Chrysanthemums 3 Handbooks, manuals, etc 3 House plants 3 Plants, Effect of nitrogen on 3 Propagation 3 less ...