Physiological Responses to Different Nitrogen Fertilization Regimes of 2 Cassava Genotypes with Different Branching Patterns
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Abstract
This study aimed to investigate the physiological responses of two cassava genotypes with different branching patterns to different nitrogen fertilizer application rates. A split-plot in a randomized complete block design with 4 replications was used. Main plot was three nitrogen fertilizer application rates, i.e., 0, 15 and 30 kg/rai (N0, N1 and N2). Subplot was two cassava varieties, i.e., Rayong 9 (non-forking) and CMR38-125-77 (forking). The results demonstrated that with difference in nitrogen fertilizer application rates, no significant difference was observed for chlorophyll florescence (Fv/Fm) at 2 and 4 months after planting (MAP), specific leaf area (SLA) at 2 and 6 MAP, crop growth rate (CGR) during 2-4 MAP, the content of chlorophylls and net assimilation rate (NAR) at all growth stages but significant difference was observed for leaf area (LA) and leaf area index (LAI) at 2 and 6 MAP and tuber dry weight at 6 MAP. However, different cassava genotypes resulted in differences in LA and LAI at 2 and 6 MAP, in SLA and CGR at 4-6 MAP and in NAR at 2-4 MAP. Furthermore, the interaction between nitrogen fertilizer application rates and genotypes was recorded for Fv/Fm, LA, LAI and tuber dry weight. It was noted that Rayong 9 showed a high response to nitrogen fertilizer application, having higher values of LA, LAI, SLA, NAR, CGR and tuber dry weight under N1 and N2 when compared to CMR38-125-77. In contrast, CMR38-125-77 showed no significant difference in canopy development (LA and LAI) and tuber yield at all nitrogen fertilizer application rates. The stepwise linear regression analysis revealed that tuber dry weight was significantly correlated with CGR at 2-4 MAP and LA at 4 MAP (R2=0.54*). Starch content was significantly correlated with several physiological traits (R2=0.78*). The information obtained from this study will be useful for the appropriate management of nitrogen fertilizer and the indirect selection of cassava varieties.
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บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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