Effect of zinc fertilizer management on seedling growth of Chai Nat 1 and Kum Doi Saket rice varieties grown in rice husk ash medium
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Abstract
The objective of this study was to evaluate the effect of zinc (Zn) fertilizer managements on seedling growth of 2 rice varieties cv. Chai Nat 1 (CNT1) and Kam Doi Saket (KDK) grown in rice husk ash medium. Zinc fertilizer was used in combination with macronutrient (N, P and K) through soil and foliar applications. The experiment was arranged in 2 × 16 factorials in CRD with three replications. Fertilizer managements were varied into 15 treatments compared with the control treatment with no fertilizer application. Shoot and root dry weights of seedling were evaluated in comparison with the control treatment. The result showed different responses on seedling growth to fertilizer managements between rice varieties, but none of the fertilizer treatments had improved seedling growth in both rice varieties, while some of the treatments had inhibited seedling growth in both varieties. The variety CNT1 had responded to fertilizer managements higher than in KDK in all fertilizer treatments. Applying Zn fertilizer in all treatments were found to have shoot and root dry weights ranging from 2.3 - 4.8 g and 0.8 - 2.1 g per seedling batch compared with 4.7 g and 2.1 g per seedling batch, respectively in the control treatment. In KDK, the dry weights of shoot and root ranged from 0.8 - 4.9 g and 0.2 -1.6 g per seedling batch compared with 4.4 g and 1.5 g per seedling batch, respectively in the control treatment. This experiment indicated that the fertilizer management had no positive effect but some management had negative impact on seedling growth in both varieties. This could be because the rice husk ash used as growing medium in this study that limit nutrient availability for seedling growth and development. The different response of seedling growth between the two varieties to the Zn fertilizer managements was an interesting phenomenon. The future study will need to vary both growing medium and rice variety together with Zn fertilizer management for the appropriate seedling production in rice.
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References
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