 |
|
 |
|
 |
|
|
|
|
|
 |
 |
|
 หัวเรื่อง:ลักษณะขนาดและอัตราการเติบโตของผลแตงกวาพันธุ์พวง ผู้เขียน: ดร.สุนทรี ยิ่งชัชวาลย์, ศาสตราจารย์ ,  Thiva Buppaprasert สื่อสิ่งพิมพ์:pdf AbstractHarvested fresh-market cucumbers 'Puang' were sampled for the measurement of their diameter, length, fresh mass and volume. Sampling was from the same experiment, which was set to study the effect of irrigation and fertilizer rates on the yield. With a split-plot design, the main plots were 3 levels of irrigation rate: 10095, 150% and 200% of potential evapotranspiration (PET), based on Penman method of 15 years average data of Kamphaeng Saen. Water was applied in furrow twice a week. The sub-plots comprised 4 levels of 2:1:1 ratio of fertilizer. These were 10 kgN, 5 kg available P205 and 5 kg K20 per rai in the first level of application, while fer?tilizer levels 2, 3, 4, were 2, 3, and 4, times the first rate. Fertilizer was split equally into 6 applications. The growing period of cucumber was 62 days. Harvest began 39 days after seeding. Experimental treatments showed no effect on the size characteristics of the fruit. The fresh mass (M in g) equals 1.034V, where V is volume in cm3, with the specific gravity = 1.041 Mg m 3. Cucumber comprised water up to 95.495 of its fresh mass. Fruit length was 2.26 times of the diameter at the middle of the fruit. Of the 361 cucumbers measured, the average fresh mass was 40.81?15.87 g, the length was 6.98?1.05 cm and the diameter was 3.11?0.42 cm. The relationship between the mass and the diameter and length was M = 0.504D1.795L1.191 However, two other relationships, namely, M = 19.572+2.749(DL) and M = 0.4208(DL) 1*472 gave equally good fit. In describing growth rate, the diameter and length of fruit were measured regularly in the morning (9?11 h) and afternoon (14-16 h) from the days of fruit setting (DAFS). Using the above relationships, the fruit mass was calculated from the size parameters. The growth rates of diameter, length as well as mass were found to he an exponential function of DAFS, in a general form of Y = A exp(BxDAFS). The results showed that the di?ameter would expand at the rate of 1.41, the length at 1.36 and the mass at 2.75 times per day. Therefore, cucum?ber would expand at so fast a rate that 9095 of all the cucumbers were ready for harvest within 5 days after fruit setting, and require daily harvesting. Cucumbers from the plots receiving water rate of 20095 of PET could be harvested 3/4 day earlier than those from the 10095 of PET plots, while fertilizer rates resulted in only 1/4 day difference. Of all the fertilizer rates, level 1 gave the best growth. Interestingly, it was found that the growth rate during daytime (a period of 5 hours from 9-14 h) was proportionally high in comparison with the rate during the rest of the day until the following morning. The size parameters had the growth rate ratio of 1:1.2 and the mass 1:1.6 during the two time periods. Apparently, the availability of photosynthate from the leaves to the fruit was necessary for lowering of the osmotic potential, so that water could flow into the fruit for its expansion. Cucum?bers in the plots that received irrigation rates at 15096 and 200% of PET had higher mass accumulation rate during daytime than those in the 100% of PET plots. |
ที่มา:การประชุมวิชาการ ครั้งที่ 47 มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:ศักยภาพการเป็นแอนติออกซิแดนท์และองค์ประกอบของสารฟีนอลิกจากเนื้อในเมล็ดมะม่วงที่สกัดหลายวิธี |
หัวเรื่อง:ผลของระดับโปรตีนในอาหารต่ออัตราการเติบโตของไก่ลูกผสมสามสายเลือด ผู้เขียน:ดร.วรวิทย์ สิริพลวัฒน์, รองศาสตราจารย์ , Suchart Sangunphan สื่อสิ่งพิมพ์:pdf AbstractTwo hundred and eighty-eight three-breed crossbred chickens from the native males cross with Changhai-Rhode females were used. The chickens were allocated and fed with 3 groups of commercial feed. The first group was fed with 22.48% protein of the broiler starter ration during day-old-6 week (wk), with 22.48% protein of the broiler starter and 21.45% protein of the grower ration in the same proportion during 7-9 wk. with 21.45% protein of the grower ration during 10-12 wk. The second group was fed with 21.45% protein of the broiler grower ration during day-old-6 wk. with 21.45% protein of the grower and 19.06% protein of the finisher ration in the same proportion during 7-9 wk. and 10-12 wk., respectively. The third group was fed with 19.06% protein of the broiler finisher ration during that 3 periods. The average body weight gain of the first, the second and the third group during day-old-6 wk. were 562.83, 497.11 and 385.07 grams (gm), during 7-9 wk. were 439.99, 424.52 and 403.99 gm. during 10-12 wk. were 427.38, 432.83 and 435.99 gm., respectively. The body weight gain data were statistically analyzed and found that it was highly significant only the period of day-old-6 wk. of age. The average feed consumption of the first, the second and the third during day-old-6 wk. of age were 1,043.37, 1,037.28 and 968.33 gm., during 7-9 wk. were 1,080.82, 1,082.42 and 1,025.68 gm., and during 10-12 wk. were 1,297.21, 1,360.11 and 1,304.77 gm., respectively. The feed conversion ratio of the first, the second and the third during day-old-6 wk. were 1.85, 2.09 and 2.52, during 7-9 wk. were 2.46, 2.55 and 2.54 and during 10-12 wk. were 3.04, 3.14 and 2.99 respectively. In consideration with weight gain per unit of feed cost, the highest weight gain per feed cost during day-old-6 wk. was the chickens fed with the first group of feed. But during 7-9 wk. and 10-12 wk. of age they were the chickens fed with third group. |
|
ที่มา:การประชุมทางวิชาการของมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 48หัวเรื่อง:ผลของการใช้ท่อพีวีซี และกล่องพลาสติกเป็นวัสดุหลบซ่อนต่ออัตราการรอดตาย และอัตราการเติบโตของปูม้า (Portunus pelagicus) ที่เลี้ยงในบ่อดิน |
ที่มา:การสัมมนาทางวนวัฒนวิทยา ครั้งที่ 9 วนวัฒนวิทยา การฟื้นฟูป่าตามแนวพระราชดำริฝ่าวิกฤตสิ่งแวดล้อมหัวเรื่อง:อัตราการเติบโต และการรอดตายของไม้พื้นเมือง 3 ชนิดที่ปลูกเสริมในสวนป่าผสม อายุ 24 ปี ณ สถานีวิจัยวนเกษตรตราด |
|