JPH07112393B2 - Cultivation method in a plant factory - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for cultivating a plant such as a vegetable in a plant factory where the environment is artificially controlled and cultivated.

[Prior Art] Conventional cultivation in plant factories aims to keep all environmental conditions as uniform as possible in order to obtain a product of uniform weight. For example, as shown in "Technology and Economics of Vegetable Factory" (1983), pages 94 to 96, the illuminance on the cultivation floor was made as uniform as possible.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, in addition to difficulty in making the illuminance uniform over a wide cultivation floor surface, and due to individual differences in the growth of the plant itself, a considerable variation in the weight of the product at the time of harvest occurs. I got it.

An object of the present invention is to provide a plant factory in which variations in the weight of the product at the time of harvest are small even if there are individual differences in plant growth.

[Means for Solving Problems] The purpose is to artificially maintain a constant gradient in the intensity of the illuminance on the cultivation floor in the growth stage after the seedling raising stage, and the individual difference of the plants generated up to the seedling raising stage. It is achieved by associating the weight of the seedling with the illuminance and the large seedling on the lower illuminance side and the small seedling on the higher illuminance side.

[Action]

The gradient of the illuminance on the cultivation floor after the seedling raising stage acts to give a difference in the growth rate of plants in the subsequent growing stages which is almost proportional to the gradient. Therefore, seedlings with uneven weight generated due to individual differences of plants up to the seedling raising stage and unevenness of environmental conditions are planted in correspondence with their size and illuminance to correct the uniformity in the subsequent growth. It

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

In Fig. 1 (a), seeds 4 are sown on a cultivation trough 3 placed at the left end of a nursery bed 1 in a plant factory. The cultivation trough 3 moves to the right, reaches the right end of the nursery bed 1, and the nursery is finished. The resulting seedlings 5 and 6 have variations in their weight. This seedling is planted in the cultivation trough 3 at the left end of the growth bed 2, grows while moving to the right on the growth bed 2, and is harvested as a product 7 at the right end.

A lamp 8 for illumination is arranged above the growing bed 2, and the growing bed 2 is illuminated only by the lamp. At this time, FIG. 1 (b)
As shown in, by adjusting the distance between the cultivation bed and the lamp (or the arrangement density of the lamps: or a combination of both), a gradient 9 is given to the magnitude of the illuminance on the cultivation bed. On the other hand, the seedlings planted at the left end of the growth floor 2 have a variable weight 5,6
Corresponds to the gradient 9 of the illuminance, and the larger one is sequentially selected from the low illuminance side. The shape of the illuminance gradient 9 on the cultivation floor is the second
Of course, the one shown in the figure can be used.

According to this embodiment, it is effective to make the weight of the product at the plant factory uniform at the time of harvest.

〔The invention's effect〕

According to the present invention, variations in the weight of seedlings that occur up to the seedling raising stage can be corrected by cultivation in the subsequent growth stage, which is effective in making the weight of the product uniform during harvesting.

[Brief description of drawings]

FIG. 1 (a) is a plan view of a plant cultivation apparatus according to an embodiment of the present invention, FIG. 1 (b) is a side view of FIG. 1 (a) and an illuminance distribution on a cultivation floor, and FIG. It is a figure which shows another method of giving the illuminance distribution of FIG. 1 ... Nursery bed, 2 ... Growth bed, 3 ... Cultivation trough, 4 ...
… Seeds, 5,6… Seedlings, 7… Harvested products, 8…
Illumination lamp, 9 ... Illuminance gradient curve.

Claims (2)

[Claims] 1. A cultivation method in a plant factory for cultivating a plant by controlling artificial environmental conditions, wherein the plant is managed in two stages of a seedling raising stage and a subsequent growing stage, and in the growing stage, A method for cultivating in a plant factory, which comprises deciding the weight of a seedling according to the weight of the seedling and applying an illuminance having the opposite relationship. 2. The method of cultivating in a plant factory according to claim 1, wherein the planting is performed in order of the weight of seedlings.