1,721,033 research outputs found
Crown development and related changes in morphology and physiology of asparagus plants associated with their productivity : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Plant Science, Institute of Natural Resources, Massey University, Palmerston North, New Zealand
Get PDFThe results are presented of eight experiments designed to investigate the influence of interrelationships between bud population dynamics and carbohydrate supply from root stores on spear production in asparagus (Asparagus officinalis L). These investigations involved studies in the field and the greenhouse, and using aeroponics and hydroponics techniques to facilitate non-destructive studies of plant development. The evidence indicated that spear yield was limited by the number of buds of adequate size for developing into marketable spears, rather than total bud number. It was shown that bud development continues throughout the harvest period. About 14% of these buds contributed to fern production after harvest, but the majority were involved, following a period of dormancy, in development of the next season's spears. Approximately 16% of the new buds contributed to spear yield in the current harvest, 68% were dormant until the following summer and contributed to 18% of total buds at that time. Spear production was most efficient in plants with large crowns, since the effects of correlative inhibition on spear development were greater in small than large crowns. Nevertheless, increase in crown size in terms of root mass is not necessarily accompanied by an equivalent increase in bud number or cluster number, and bud availability is potentially an important yield limiting factor. However, large crowns reduced the period of correlative inhibition within a bud cluster. Crown size and bud population were sensitive to nutrient supply, and it is suggested that control of nutrient supply over the harvest period may be best achieved by use of slow-release fertilizer or split application of nitrogen. Carbohydrate partitioning and possibly photosynthetic rate were also sensitive to daylength, and there was some evidence of genotypic variation in the response to daylength changes and contrasts. Principal component analysis indicated that numbers of buds and bud clusters, plant size and chlorophyll content were the main determinants of spear yield, and cluster analysis demonstrated potentially important genetic variation for these variables in potentially high yielding cultivars. Spear yield is the product of harvest intensity and harvest duration, and harvest duration itself was shown to be sensitive to genotype and management effects on bud initiation and development. A conceptual model is used to illustrate the influence of bud population and bud cluster characteristics on harvest intensity and duration, and on spear yield, and the relative importance of management manipulation of bud dynamics and carbohydrate supply to spear yield
Cases Study: Evaluation of Student Readyness in Teaching After Microteaching
Get PDFCapability to teach is expected to have by Biology Education students after having Microteaching. Case study was conducted to evaluate how teaching performance of students from the start to the end of microteaching. Research samples were 6 students of Biology Education Study at 6th semester. microteaching was done online and offline. Eight skills was firstly conducted online step by step. Each performance was evaluated by other students and written in log book. Evaluation was used to improve each performance. Microteaching was continuedly offline in which students must performe teaching three times, two with supervision dan one independenly. Improvement had given for a better performance supervised for opening to closure of teaching. Results from online and offline training was implemented in independent teaching performance for 30 minutes. Teaching performance was evaluated by 15 students of 2nd semester acting as high school pupils by using questionare. All six students were evaluated having clear and loud voice but lack of ability to motivate their pupils to learn. Most students stayed closely with PPT slides. Students also had difficutly to manage the time so teaching closure and evaluation could not be done
A phenological study of snap bean (Phaseolus vulgaris L.) for predicting harvest
Get PDFField studies were conducted in 1989 and 1990 at Knoxville and in 1990 at Crossville, Tennessee to observe the phenology of snap bean (Phaseolus vulgaris L.) and to develop heat unit models for the cultivars \u27Eagle\u27 and \u27Provider\u27. The best models were selected to predict bean plant development, especially the time to harvest maturity.
The experimental design was a randomized complete block with sub treatments in a split plot arrangement. The main treatments were cultivars \u27Eagle\u27 and \u27Provider\u27. Sub plot treatments consisted of 10 planting dates at Knoxville and 6 planting dates at Crossville. Phenological observations were taken on a weekly basis and analyzed using ten methods of heat unit summation. Data on pod yield, pod distribution, and fiber content were recorded.
Since none of the ten methods of heat unit summation utilized resulted in consistently low coefficients of variation (c.v.), a model of growing degree days using the conventional method in which daily mean temperatures minus the base temperature 10°C (50°F) were summed was performed for snap bean in this study. A greater number of heat units was required at Knoxville than at Crossville to obtain harvest maturity for both cultivars. Results from multivariate regression analysis indicated the highest was obtained in 1989 at Knoxville and in 1990 at Crossville for the model including five variables; growing degree days (GDD), solar radiation (RAD), air relative humidity (ARH), wind speed (WSP), and precipitation (PPT). Solar radiation (RAD) resulted in a greater R2 than growing degree days in 1990 at Knoxville and Crossville when canopy height temperature and height relative humidity, and soil temperatures at 2.5 cm and 10.2 cm (1 and 4 inch) depth were added to the regression models.
Pod yield was significantly influenced by planting date over all experiments although it was not influenced by cultivars. Pod fiber content was greatest from plants at the latest planting date in 1989 at Knoxville. The pod fiber content, however, was affected only by pod size in 1990 at Knoxville and at Crossville.
Results of these experiments in arriving at the best heat accumulation models for predicting the time of harvest maturity suggested that further research is needed since the best model was different for each experiment. A more precise description of each phenological stage and more frequent observations would improve the model. Other possibilities might include using base temperatures other than 10°C (50°F) and using different base temperatures for vegetative stages and reproductive stages although this approach would change the current assumption of heat unit summation
Pengaruh perbedaan nutrisi terhadap pertumbuhan selada (Lactuca sativa L.) pada media praktikum hidroponik rakit apung
No full textTujuan penelitian ini adalah mengukur pertumbuhan tanaman selada. Penelitian ini menggunakan Rancangan Acak Lengakap (RAL) Faktorial dengan faktor utama (hiroponik rakit apung dan rasio nutrisi), dan faktor kombinasi antara keduanya. Pengukuran dilakukan selama 14 hari (7 kali pengamatan) dengan enam parameter (panjang akar, tinggi tanaman, jumlah daun, kadar klorofil, berat basah dan berat kering). Data dianalisis menggunakan SAS. Jika terdapat perlakuan yang signifikan dilanjutkan dengan uji LSD pada alfa 0,05. Hasil menunjukan rakit apung dinamis meningkatkan pertumbuhan selada secara signifikan dibandingkan rakit apung statis. Rasio nutrisi N3 meningkatkan pertumbuhan selada secara signifikan dibandingkan rasio nutrisi lainnya pada semua parameter kecuali jumlah daun. Kombinasi antara rakit apung dinamis dan rasio nutrisi N3 merupakan pertumbuhan tanaman selada tertinggi secara signifikan dibandingkan dengan 7 kombinasi lain
Distribusi dan Luas Stomata pada Enam Jenis Tanaman Dikotil
Get PDFStomatal distribution and area are related to transpiration rate. This study measured stomatal distribution and area in dicotyledon plants used as ornamental plants. The study used Factorial Completely Randomized Design (CRD) with the main factors were six types of dicotyledon plants and three plant parts (top, middle and bottom). Combination factors were the interaction of plant species and parts. By using the replica method and micrometer, the study used five replications with the measured parameters: the stomatal distribution and area. Data were analyzed using SAS with the Factorial RAL model and continued with the LSD test if the treatments were significant. Correlation coefficients between stomatal distribution and area were calculated to see the relationship between the two. The types and plant parts significantly affected the stomatal distribution, while the stomatal area was influenced by the main and combination factors. Syzygium paniculatum Gaertn had the highest stomatal distribution and was different from other plant types. Meanwhile, lower leaves had the lowest stomatal distribution and differed from the middle and upper. Aerva sanguinolenta Bl had the highest stomatal area (591.05) compared to other plant species. The stomatal area on the plant\u27s upper leaves (272,71) was significantly lower than the middle and lower parts. The combination between species and the lower part of the plant produced the highest stomatal area compared to other combinations. Stomatal distribution was inversely proportional to the stomatal area.
Keywords: dicotyledon, part of plant, stomatal area, stomatal distributio
RESPON SISWA DAN EVALUASI PEMBELAJARAN PADA PRAKTIKUM SUBMATERI PERAN TUMBUHAN DI BIDANG EKONOMI
No full textPeran tumbuhan di bidang ekonomi merupakan salah satu submateri pada materi Plantae. Submateri ini pada umumnya disampaikan secara teoritis tanpa dilakukan praktikum. Namun demikian, pada penelitian ini dilakukan dengan praktikum dan berbantuan bahan ajar LKS kontekstual. Praktikum yang dilakukan merupakan pembuatan cookies menggunakan buah pisang. Penelitian ini dilakukan untuk mengetahui respon siswa terhadap praktikum pembuatan cookies pisang. Metode pengumpulan data menggunakan angket respon, bersamaan dengan penilaian afektif dan psikomotor dengan lembar observasi, sedangkan penilaian kognitif menggunakan soal pada lembar kerja siswa. Angket respon terdiri atas 10 pernyataan. Hasil angket respon dianalisis dengan menggunakan skala likert. Hasil menunjukkan respon siswa terhadap praktikum sebesar 86,66% dan termasuk kategori sangat tinggi. Selain itu, pembelajaran dengan praktikum berbantuan LKS kontekstual dapat meningkatkan nilai kognitif (86,46), afektif (95,9) dan psikomotorik (94,9) yang dikategorikan sangat tinggi
Distribusi dan Luas Stomata pada Tanaman Hias Monokotil
Get PDFOrnamental plants give beauty to the surrounding environment. Fresh air is created around the plant. It is concerned with transpiration which relates to the distribution and extent of stomata. The study measured the distribution and extent of stomata in monocot plants used as houseplants. The experimental design used a complete randomized design (RAL) factorial with five replications. The main factors were six types of monocot plants and three parts of plants (top, middle, and bottom). The interaction between plant types and parts was a combination factor. The distribution and area of the stomata were measured using replica methods and micrometers. The data was analyzed using the factorial RAL model statistical analysis system and followed up with the smallest real different test for significant treatment. The distribution of stomata was correlated with the stomata area to observe the relationship between the two. Plant types, plant parts, and combinations of both have a noticeable effect on the stomata distribution and area. The Paris lilies (Chlorophytum comosum (Thumb) Jacq.) have the highest stomata distribution (20.53%) compared to others, with a stomata area of 291.89 μm2. Meanwhile, the top part of the plant has the highest distribution and differs from the middle and bottom. The highest stomata distribution is at the top of the plant (15.02%) and lowest at the bottom (11.96%), while the smallest stomata area is at the top of the plant (687.62 μm2) and the widest is at the bottom (813.88 μm2). The stomata distribution correlates inversely with the stomata area of both plant types, plant parts, and a combination of both.
Keywords: ornamental plants, monocotyledon, stomatal area, stomatal distributio
KELAYAKAN MEDIA PEMBELAJARAN POSTER KANDUNGAN GIZI APEL YANG DIPERJUALBELIKAN DI KOTA PONTIANAK
Get PDFAbstrak: Penelitian ini bertujuan untuk mengetahui kelayakan media pembelajaran poster kandungan gizi apel (Malus sylvestris) yang diperjualbelikan di kota Pontianak pada sub materi zat makanan kelas XI SMA. Bentuk penelitian ini yaitu penelitian deskriptif dengan teknik pengumpulan data non tes berupa angket. Validasi dilakukan oleh pakar, yakni 2 orang dosen Pendidikan Biologi dan 3 orang guru biologi kelas XI SMA di Kota Pontianak. Teknik analisis data menggunakan Content Validity Ratio (CVR). Hasil analisis data menunjukkan bahwa poster kandungan gizi apel (Malus sylvestris) yang diperjualbelikan di kota Pontianak layak digunakan sebagai media pembelajaran pada sub materi zat makanan kelas XI SMA karena seluruh kriteria penilaian telah mencapai nilai CVR minimum Lawshe sebesar 0,99. Kata Kunci: Kelayakan poster, Kandungan gizi apel Abstract: This study aimed to know the feasibility of poster about apple (Malus sylvestris) nutrient content which were sold in Pontianak as a learning medium on sub material about nutrient in class XI SMA. This study form was descriptive with questionnaire as non-test collection data technique. Validation was done by the experts, they were 2 Biology Education lectures and 3 biology high school teachers in Pontianak. The technique of data analysis used Content Validity Ratio (CVR). The result of data analysis showed that the poster about apple nutrient content sold in Pontianak feasible to use as a learning medium on sub material about nutrient in class XI SMA because all of assessment criteria had reached the minimum Lawshe CVR value (0.99). Key Words: Poster feasibility, Apple nutrient conten
KELAYAKAN MEDIA PEMBELAJARAN POSTER KANDUNGAN GIZI BUAH ALPUKAT DAN BUAH NAGA PADA SUB MATERI ZAT MAKANAN
Get PDFThis research aimed to determine the feasibility of poster as a learning medium of the food substances material for class XI Senior High School that made from the study result of the nutrients content and fiber avocado and dragonfruit wich were sold in Pontianak. Poster as learning medium of food substances material was conducted in the form of descriptive research and technique analyzed by using Content Validity Ratio (CVR). Validation was done by five people; they were 2 Biology Education lectures and 3 biology high school teachers in Pontianak, with 12 assessment criteria. Validation results showed that all the assessment criteria had reached the minimum value of the CVR Lawshe of 0.99. It was categorized valid to use as a learning medium for sub material food substances in class XI Senior High School. Keywords: Poster feasibility, nutrient, fiber, avocado, dragonfruit
- …
