ISHS Acta Horticulturae 97: VI Symposium on Horticultural Economics
YIELD RESTRICTING FACTORS IN GROWING CUTROSES UNDER GLASS IN WINTER |
| Author: | E. van Rijssel |
| Abstract:
The results of horticultural nurseries show big differences every year (A.E.R.I.); the activities of the Advisory Service in Holland cannot limit these differences. The growers and other insiders say: "All depends on the capacities of the grower". We aimed to analyse the grower's capacities by a nursery-comparing study but for this purpose we had to make a division first. In horticulture we can distinguish the following groups: vegetables in the open or under glass, fruits, ornamentals or potplants. When comparing these groups we see differences in profitability between them, but also we can see that the profitability is changing every year (see table 1). The influence of the weather is big, firstly to the produced quantity per ha and secondly to the market demand. In each of the main groups people grow a number of crops and between these crops we can see the same differences as between the main groups in horticulture. We thought the best way of making a division for analysing the grower's capacities without the influence of the weather, was to take holdings all growing the same crop in just about the same way. We took the cutrose "Sonia" on nurseries with heated glasshouses. In such a comparable group of holdings, independent of what crop they grow, we see a large variation in economical results (D. Meijaard). For the rose nurseries only 30 percent of the differences could be related to a different cost level, and 70% related to the yield of a square meter crop. Yield is influenced by the chosen variety for 1/3 (see table 2), the other part cannot be declared yet, Thus the differences in financial yield in growing a crop with the same variety of roses are responsible for 2/3 × 70% = 50% of the differences in profitability on rose nurseries (van Rijssel). The proceeds of a given holding are rather stable and show the growing capacities of the growers, so we hoped that analysing the restricting keypoints in growing roses would be helpful to change the way of growing to get a better crop. To do this we chose a group of nearly 40 nurseries, all growing the variety "Sonia" for a nursery-comparing study. This took half a year during winter time from 21 October until 11 April 1976. | |
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