2018 Volume 17 Issue 4 Pages 431-437
For the double cropping of cucumber in a greenhouse, alternating cultivation with soil and grow bags is more cost-effective than cultivation with only soil or grow bags. Therefore, to establish a cultivation method, coir grow bag cultivation was examined in the summer. As a result, stable growth and equal or high yield could be achieved, compared with those of soil cultivation, by placing a drainage pot that monitors drainage to optimize the supply of nutrient solution. In addition, no root-knot nematodes were found in grow bags placed on plastic mulch beds in a field markedly polluted with root-knot nematodes, with the larval density in the soil under the grow bags reduced to 1/17 during the cultivation. Furthermore, the nutrient supply was partially changed from nutrient solution to raw water to reduce the application of fertilizer, lowering the total emission of nitrate nitrogen in the soil to 8.5 g・m–2, demonstrating the high practicability of the coir grow bag cultivation in the summer.
