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Table of contents

• Authors 5
• Preface 7
• Abbreviations 9
• 1 Introduction 11
• 2 Trials in Organic Horticulture 13
  • 2.1 Separation from conventional cropping 13
  • 2.2 Crop rotation and plant material 13
  • 2.3 Trial designs 13
    • 2.3.1 Plots and treatments 14
    • 2.3.2 Controls and other comparisons 14
    • 2.3.3 Replications and randomisation 15
    • 2.3.4 Fully randomised design 15
    • 2.3.5 Block design 15
    • 2.3.6 Latin Square design 16
    • 2.3.7 Split plot design 16
    • 2.3.8 Fully factorial design 17
    • 2.3.9 Simplified designs for on-farm trials 17
  • 2.4 Recording results 18
    • 2.4.1 Recording information 18
    • 2.4.2 Missing values 19
    • 2.4.3 Harvest records 19
    • 2.4.4 Time measurement 19
  • 2.5 Data analysis and statistics 20
    • 2.5.1 Plot values 20
    • 2.5.2 Statistical analysis 21
  • 2.6 Writing up an experimental report 21
• 3 Key Types of Experiments 23
  • 3.1 Crop variety trials 23
    • 3.1.1 Variety comparison experiments 23
    • 3.1.2 Grafting experiments 25
  • 3.2 Fertilisation experiments 28
    • 3.2.1 Experiments with solid fertilisers, manures and commercial products 28
    • 3.2.2 Experiments with liquid fertilisers 32
    • 3.2.3 Experiments with compost 34
    • 3.2.4 Experiments with green manures 35
    • 3.2.5 Fertilising experiments in growing media used for transplant production, potted herbs or ornamentals 38
    • 3.2.6 Evaluation of container growing media 40
  • 3.3 Experiments on weed control 41
    • 3.3.1 Weed control 41
    • 3.3.2 Evaluation of mulching materials 42
  • 3.4 Plant protection experiments 43
    • 3.4.1 Evaluation of fungicides and insecticides in organic cropping 43
    • 3.4.2 Evaluation of bio control agents and natural enemies 45
    • 3.4.3 Enhancements to biodiversity using flower strips 48
  • 3.5 Other types of experiments 50
    • 3.5.1 Evaluation of greenhouse infrastructure 50
    • 3.5.2 Irrigation systems 53
    • 3.5.3 Pollination 59
  • 3.6 Economic evaluation of crop trials 61
  • 3.7 Participative experiments and on farm research 65
• 4 Guidelines for Selected Crops 69
  • 4.1 Introduction 69
  • 4.2 Fruit vegetables 71
    • 4.2.1 Tomatoes 71
    • 4.2.2 Eggplant 76
    • 4.2.3 Peppers 82
    • 4.2.4 Courgette 87
    • 4.2.5 Cucumbers 91
    • 4.2.6 Watermelon 95
    • 4.2.7 Melons 99
  • 4.3 Leafy vegetables 102
    • 4.3.1 Lamb’s lettuce 102
    • 4.3.2 Lettuce 105
    • 4.3.3 Rocket and other baby leaf brassica salads 108
  • 4.4 Other vegetables 110
    • 4.4.1 Climbing beans 110
    • 4.4.2 Kohlrabi 115
    • 4.4.3 Radish 118
    • 4.4.4 Spring onion 121
  • 4.5 Transplants 123
    • 4.5.1 Vegetable transplants 123
  • 4.6 Herbs 125
    • 4.6.1 Parsley 125
    • 4.6.2 Basil - grown in pots 128
  • 4.7 Perennial fruits 131
    • 4.7.1 Strawberries 131
    • 4.7.2 Raspberries 135
    • 4.7.3 Table grapes 138
    • 4.7.4 Papaya 141
    • 4.7.5 Mango 145
  • 4.8 Ornamentals 148
    • 4.8.1 Pelargoniums cultivated in pots 148
• 5 Appendices 151
  • 5.1 Appendix A: General information 151
  • 5.2 Appendix B: Summary table of crop nutrient demand 152
  • 5.3 Appendix C: Summary of nutrient content of crop tissues 154

Auteurs: Koller, M., Rayns, F., Cubison, S. and Schmutz, U.

Handbook: Guidelines for Experimental Practice in Organic Greenhouse Horticulture

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