???????????????????????????????????????????????????????????????????????????????????????????? | Effects of chemical fertilizer rates on shoot and root growth of corn in rhizotron
2021
Tiwa Pakoktom(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Agronomy) | Norasat Phatyai(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Agronomy) | Wipawee Juykeawpanao(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Agronomy) | Manika Yamsook(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Agronomy) | Nongpat Chaichana(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Soil Science)
The objectives of this study were to study the growth of stem and root of corn by using Rhizontron technique and study the effects of fertilizer application on corn root growth and development. The experiment was arranged in a Completely Randomized Design (CRD) consisting of 4 treatments with 3 replications. The four treatments were chemical fertilizer (16-20-0) at the rate of 0, 25, 50 and 75 kg/rai applied at planting date. The growth and development of corn root during the study were captured on Rhizotron by camera and analyzed the total root length and projected area by using WinRhizo program. The results indicated that the corn with no fertilizer application gave the lowest value for plant height, stalk diameter, leaf greenness and leaf area, when compared with other rates. The growth of root showed that the corn root length and projected area were gradually increased after planting and reached the highest at 70 days after planting (DAP). Moreover, the growth of corn root that the application of fertilizer (16-20-0) at the rate 0 kg/rai showed lowest when compared with other rates. The highest was the application rate at 75 kg/rai and this rate produced the total root length of 7, 936 cm and projected area was 867 cm2. Future more, the application of fertilizer (16-20-0) at the rate of 0 kg/rai resulted in the lowest yield per plant. The highest yield per plant obtained with the application of fertilizer (16-20-0) at the rate of 25 kg/rai. In addition, the Rhizotron technique performs suitably through the season without damaging the plant samples when the growth of corn root system response to fertilizer application is considered
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