Studies of the production techniques of container nursery stock in Alstonia scholaris (L.) R. Br. and Cinnamomum camphora (Linn.) Sieb.

• Main Authors: Chen-Yu Lin, 林楨祐
• Other Authors: Yu-Sen Chang
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/93978023380598932235

碩士 === 國立臺灣大學 === 園藝學研究所 === 87 === Nursery stock in cotainer provided an effective, conventient, and economical production methods. However, there were still some disadvantages; for example, greater changes of soil temperature, inferior drainage of the container bottom, and easily occurance of circling root ,etc. The objectives of this study was firstly to determine the advantages and disadvantages of the container grown and the field grown nursery stock, in order to find out the most appropriate method for the growth of Alstonia scholaris and Cinnamomum camphora. We compared the effect of the container exterior color and PIP on reducing the high soil temperature, and examined the soil condition in different drainage holes of containers, and then to investigate the influence of the reduced circling root methods on the nursery stock. Comparing the growth between the field grown and container nursery (plastic container and fabric bag) showed that the lower soil oxygen diffusion rate (ODR) slowed down the growth of fabric bag and field grown nursery stock. The plastic container had better drainage and higher ODR. Nursery stock grown in plastic vigor than fabric bag grown and field grown trees. Growth and nursery stock quality of Alstonia scholaris and Cinnamomum camphora in hard pot were similar to in soft pot. However, trees in hard pot were more stable under windy condition during production than grown in soft pot. Comparing the soil temperature between the container color and PIP showed that red container had greater daily maximum soil temperature than white container and PIP. Daily maximum soil temperature of three quadrant in PIP were lower, more average and had less change than other containers. Therefore, growth of nursery stock in PIP were better, which improved the growth of Alstonia scholaris either befor or after transplanting. Besides, growth of bedding plants in PIP were better both at the seeding stage and after transplanting. The location of container drainage holes would affect the growth of nursery stock as well. Soil ODR is highest under the lateral drainage holes treatment and lowest under bottom drainage holes treatment. Soil humidity was higher under lateral drainage holes treatment than bottom drainage holes treatment. Dry weight of shoot and root, and quality were all better under lateral drainage holes treatment. Bottom drainage holes treatment had lower soil ODR than the other containers. The plant was shorter, and the root would stretch outside the container easily. Comparing the Growth of reduced circling root methode (Copper-treated, vertical rib and air-pruning), the result showed that copper-treated applied to interior wall of container effectively reduced the growth of roots on the periphery of rootball, and reduced the forming of circling roots; however, copper-treated did not completely control the phenomenon of circling roots. Copper-treated improved 0-2mm fine root growth of nursery stock and promoted the vigor of the roots. Morever, copper-treated increased the producing rate of the plant’s height and leaves. Copper-treated increased more coarse roots and better nursery stock quality than non-treated container after transplanting. By comparing of the effect on improving circling roots, the copper-treated container was better than vertical rib and air-pruning container. It was because that the effect of vertical ribs limited to the lateral of the container, and the effect of air-pruning was limited to the bottom of the container.