《Table 1.Effects of gradual soil drying on soil and plant analyzer development(SPAD)value of seven r

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《Morpho-Physiological Response of Oryza glaberrima to Gradual Soil Drying》

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At 23 DAT，two plants were sampled from each treatment and separated into root，stem（culm+sheath）and leaf fractions.Shoot dry weight was obtained by adding leaf dry weight with stem dry weight.The sum of shoot and root dry weight was calculated as the total dry weight.Root morphological parameters were measured using an image analysis system（Regent Instruments Inc.，WinRHIZO）to assess the length，surface area and volume.Roots were divided into two types according to the root diameter，i.e.fine（≤0.5 mm）and coarse roots（>0.5 mm）（Huang et al，2015）.Leaf surface area was calculated using the digital image analysis software（LIA32，developed by Kazukiyo YAMAMOTO，Nagoya University，Japan）.Total leaf surface area（TLA）was measured on the fresh samples，while specific leaf area（SLA）and specific leaf weight（SLW）were calculated after drying.SLA was the ratio of TLAto dry mass，while SLW was the ratio of dry mass to TLA.Per each sampled plant，roots，stems and leaves were oven-dried at70oC for 2 d to determine their dry weights.