PLASTIC BELLS AS SHADY PROTECTION AT THE MOMENT OF TRANSPLANTATION
This technique causes a considerable stasis in the growing so that it is necessary to eliminate, at the moment of the carthing, a great part of the leafy portion in order to reduce the transpiration and, in this way, to get over the critical moment as soon as possible.
Besides it is necessary to supply frequent irrigations which are protacted for a long period during the cultivation. At the moment of transplantation the cutting off of the root-apparatus is required, but this operation aims essentially at hastening the transplantation itself.
Our researches aimed at valueing the importance of the shady protection made upon celeries at the moment of transplantation by rigid bells of plastic. We have considered two variants: the elimination of the leafy lamina and the quantity of water given to the plants immediately after the transplantation and also during the first stage of growing.
For the researches considered there have been prepared the following lots:
|half irrigated||not lopped||Uncovered||(6)|
Each lot was made of 50 celeries with two repetitions of 25 plants each placed on two rows.
The bells used as shading are made of white, rigid, (thickness 3/10 mm.) PVC, having a truncate cone form (sizes in cm: 21, 5 inferior base, 19, 5 superior base, 15 height and complessive width cm. 27).
We chosed 300 celery-plants from the culitvar "Verde di Imola" having sizes and growth as much uniform as possible.
They presented six little leaves and their length was of 12–15 cm., the average weight of each of them was of 62 gr., reduced to 45 gr. in the lopped lots.
The soil chosen for the cultivation was an average mixture tending to the slimy, fertile, naturally fresh. A great quantity of manure had been given to the preceding cultivation (Borlotto beans) and at the ploughing-time 3 q. li/Ha of fertilizer NPK 10 – 10 – 10.
The transplantation was made on the 17 of July 1967 using about 45.000 plants per Ha (distances : cm. 80 between rows and cm. 28 between each celery-plant on the row).
The same day of the transplantation there was made the first spraying delivering 12 mm. of water (4 mm. each hour). After eight and sixteen days two more spraying were made, always delivering 12 mm. of water.