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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Spatial Dispersion and Optimum Sample Size for Cotton Bollworm, Helicoverpa armigera (H?bner) (Lepidoptera: Noctuidae) Larvae on Cotton) ผู้เขียน: Ohnmar Khaing,  ดร.ประภารัจ หอมจันทน์, ศาสตราจารย์ , Surachrat Jamornmarn, Ngarmchuen Ratanadilok, นางอรุณี วงศ์ปิยะสถิตย์, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractField experiments were conducted in the irrigated and the rain-fed crops of 2000 and 2001 at Suwan Farm, Pak Chong, Nakon Ratchasima, Northeastern Thailand to determine the spatial dispersion of cotton bollworm, Helicoverpa armigera (H?bner) larvae on four cotton varieties/lines, namely, AP1 and AP2, the mutant lines, SR60 (Sri Samrong 60) and SD1 (Sarid1), the recommended varieties. RCB was used with four replicates for both crops. The spatial dispersion was analyzed using the variance-to-mean ratio (s2/ x), Morisita’s Index (I?) and the negative binomial parameter (k). Although cotton bollworm larvae exhibited mainly clumped distribution, sometimes it was found to be randomly disperse during the sampling periods of both crops. In general, H. armigera larvae were at high aggregation (k=0.10) on the irrigated crop and low aggregation (k=3.92) on the rain-fed crop. The dispersion information was used to select an optimum sample size at the 0.05 probability. The optimum sample size of 15 and 30 plants per 140 m2 were needed to monitor low and high aggregation levels of H. armigera larvae, respectively. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Repeatability, Optimal Sample Size of Measurement and Phenotypic Correlations of Quantitative Traits in Guava) ผู้เขียน:ดร.อุณารุจ บุญประกอบ, รองศาสตราจารย์ , ดร.เกรียงศักดิ์ ไทยพงษ์, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractFive fruits from each of 11 guava genotypes were evaluated in dry and early rainy seasons under Thailand conditions for fruit weight, flesh thickness, flesh weight, seed cavity (central pulp) weight, fruit firmness, total soluble solids, titratable acidity, juice acidity, and ascorbic acid to estimate repeatability (R), phenotypic correlations (r), and to predict the optimal sample size. The repeatability of the fruit weight, flesh thickness, flesh weight, seed cavity weight, titratable acidity, juice acidity, and ascorbic acid were relatively high (R ? 0.60). The flesh thickness, titratable acidity, juice acidity, and ascorbic acid were the traits with highest estimates, 0.85, 0.85, 0.87, 0.76 and 0.85, 0.83, 0.84, 0.80 in dry and early rainy seasons, respectively. Based on a threshold of 10% increase in relative efficiency, a sample of three fruits was sufficient for evaluating guava fruit traits. Most physical traits (fruit weight, flesh thickness, flesh weight, and seed cavity weight) had weak negative correlations (-0.25 ? r ? –0.38) with chemical traits (total soluble solids, titratable acidity, and ascorbic acid). Fruit firmness had no correlation with all other fruit traits. There were strong positive correlations between fruit weight and flesh thickness (r = 0.81), flesh weight (r = 0.99), and seed cavity weight (r = 0.88). Therefore, fruit weight could be used as an indirect selection for flesh thickness, flesh weight, and seed cavity weight. |
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