זיהוי בעיות גידול

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גורמים שונים משפיעים על גידול הצמח

חוסר או עודף של מים, אור, דשן, טמפרטורה(אקלים), לחות, מבנה האדמה וטיבה ישפיעו על גידול הצמח לטובה או לרעה. במקרים של בעיות גידול יותקפו הצמחים ע"י מזיקים ומחלות בייתר קלות :-(

Plant Growth Factors
Growth Factor
Optimum
Excess
Deficiency
Water Amount of water varies with other factors. Vegetables need 1 in. per week. Sandy soil or rubble may need 2 in. per week (including rainfall). Soil should be moist all the way down to 6 ft. after watering. Plant is yellowed, has soft rot, no fl owers or fruit; becomes disease-prone. Plant grows slowly or is stunted, has leaf drop, wilting, bears early but small fl owers and fruit.
Light Varies with other factors. Generally, fruit and seed crops need at least 8 hrs. direct sun. Leafy crops and some root crops need at least 6 hrs. of sun. Leaf becomes scorched; plant has no fl owers or fruit. Plant has elongated, pale growth (etiolation), no fl owers or fruit.
Temperature Varies with specific crop. Plant has soft rapid growth, shows leaf scorch, has poor or no fl owers and fruit. Plant grows slowly or is stunted, shows leaf scorch, has poor or no fl owers and fruit.
Humidity Limited data available for fi eld crops. In humid regions, allow adequate spacing for air circulation. Plant is disease-prone, has soft growth, and poor fl owers and fruit. Plant grows slowly; wilts, drops leaves, bears no fl owers or fruit.
Fertilizer High nitrogen for foliage only. Plant has rapid, soft growth; leaves and roots burn; has no fl owers or fruit. Plant is stunted, yellowing, has small or no fl owers or fruits.
Soil If the soil is well-aerated, welldrained, loose, and friable, growth will be optimum. If the soil is hard-packed, poorly drained and aerated, the plant will be stunted with poor fl owers and fruit X X
Adapted from: Pierce, J. H. 1977. Greenhouse Growhow, Plants Alive, Washington, D.C.
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