Effect of planting date on vegetative growth in greenhouse tomato crops.
Notice bibliographique
Résumé
Leaf length, stem diameter and shoot growth in three June and two September, February and March plantings of tomato cv. Conqueror were measured every 14 days during the life of each crop. Crops were grown using a deep flow technique growing system in twin-skin polythene greenhouses. Leaf length and stem diameter readings were similar to Dutch guidelines for much of the life of the June plantings but were not in the other plantings. Shoot growth increments were similar to the Dutch guidelines. Possible causes of seasonal and between country differences are discussed. Additional key words: cv. Conqueror, deep flow technique growing system, twin-skin polythene greenhouses. Introduction Year round tomato (Lycopersicon esculentum L.) greenhouse production is achieved in the Auckland region and, in many other parts of New Zealand (HortNZ, 2007) through the use of a range of planting times. Thus, throughout a year, plants of different ages and crop loads are exposed to different light and temperature environments. We could, therefore, expect different patterns of vegetative growth to be seen at different planting times. In this study we recorded leaf length, stem diameter and shoot growth in a sample of plants of every planting of one cultivar in two neighbouring, greenhouses from June 2004. These measurements are used by consultants (including Canadian advisors) (Portree et al., 1996) and the Substratus Horticultural Crop Consultancy of Holland, one of the world’s largest greenhouse vegetable crop consultancy companies) and growers to monitor and compare tomato crops (but not widely in New Zealand). Our purpose was to retrospectively examine rather than monitor growth. We wished to identify differences in growth patterns at different planting times and to compare our results with the guidelines in Northern Hemisphere crop registration tools, e.g. those of the Substratus Horticultural Crop Consultancy (http://www.grodan.com/sw10039.asp). Results from winter, spring, late summer and early autumn plantings are described and discussed. Materials and Methods This study was conducted on plants in commercial crops growing in two double plastic covered greenhouses (termed houses A and B) at Waimauku (36 46’ S, 174 30’ E), in Rodney County, New Zealand). The greenhouses were similar in size (4,000 m), construction, growing systems (using deep flow technique), planting density, venting and heating set points, humidity settings, radiation received, irrigation treatments, electrical conductivity (EC), nutrition and crop management systems.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».