Download or read book Effect of Plant Height on Light Interception Water Use and Yield of Grain Sorghum in Pure and Mixed Canopies written by Joseph Jimoh Owonubi and published by . This book was released on 1980 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Samaru Journal of Agriculture Research written by and published by . This book was released on 1990 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1980 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sorghum Bibliography 1977 80 written by and published by . This book was released on 1984 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin signal tique 381 written by and published by . This book was released on 1981 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Retrospective Index to Nigerian Doctoral Dissertations and Masters Theses 1895 1980 Science technology written by Patrick E. Ofori and published by . This book was released on 1984 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1979 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Population Effects on Water Extraction Pattern Growth and Yield of Non irrigated Grain Sorghum written by Fernando Ajmad and published by . This book was released on 1975 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Planting Geometry Hybrid Maturity and Population Density on Yield and Yield Components in Sorghum written by Kalaiyarasi Pidaran and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Prior studies indicate clumped planting can increase grain sorghum yield up to 45% under water deficit conditions by reducing tiller number, increasing radiation use efficiency, and preserving soil water for grain fill. The objective of this study was to evaluate effects of planting geometry on sorghum grain yield. The field study was conducted in seven environments with two sorghum hybrids, four populations, and two planting geometries. Crop responses included leaf area index, yield, and components of yield. Delayed planting decreased yield by 39%, and a later maturing hybrid increased yield, relative to an early hybrid, by 11% under water sufficiency. Clumped planting increased the fraction of fertile culms (culms which formed panicles) from 5-14%. It reduced the number of culms m−2 by 12% under water limiting conditions (at one of two locations) but increased culms m−2 16% under water sufficiency. Seeds per panicle and seed weight generally compensated for differences in panicles m−2, which were related to different planting population densities. Although agronomic characteristics of hybrids varying in maturity have been widely studied, little information exists concerning their physiological differences. Therefore, the objective of the greenhouse study was to determine if stomatal resistance, leaf temperature, and leaf chlorophyll content differed between two DeKalb grain sorghum [Sorghum bicolor (L.) Moench] hybrids. They were DKS 36-16 and DKS 44-20, of medium-early and medium maturity, respectively, when grown under field conditions in Kansas. Seeds were planted in a greenhouse. Stomatal resistance and leaf temperature were measured 55 days after planting with a Decagon Devices (Pullman, WA) diffusion porometer, and chlorophyll content was measured 119 days after planting with a Konica Minolta (Osaka, Japan) SPAD chlorophyll meter. The two hybrids did not differ in stomatal resistance, leaf temperature, chlorophyll content, height, and dry weight. Their difference in maturity was not evident under the greenhouse conditions. Future work needs to show if hybrids of different maturities vary in physiological characteristics.

Download or read book Growth Development and Yield of Sorghum in the Field Under Variable Water Supply written by Elias Fereres and published by . This book was released on 1976 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index Agriculture written by and published by . This book was released on 1984 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Different Light Intensities Nitrogen Levels and Population Densities on Grain Sorghum written by C. D. Carcallas and published by . This book was released on 1975 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain sorghum (Cosor 3) was grown under three light regimes, i.e., in full sunlight, 25% shade, and 50% shade at three levels each of nitrogen and plant population density to evaluate its yield and other, important characteristicssuch as: leaf lenght, leaf width, leaf area index,100-grain weight, grains per panicle, panicle yield, grain-stover ratio, threshing percentage, total dry matter production, panicle lenght, plant height and number of days to blooming. In addition, leaf nitratereductase activity and grain tannin concentration were analyzed. Plantpopulation densities used were 150, 000, 200, 000 and 250,000 plt/ha; the nitrogen levels at 0, 75, and 150 Kg N/ha; and 0, 25, 50 per cent shading. The statistical design split-split plot was used with plant population density as the main plot, nitrogen level as the sub plot, and light intensity as the sub-sub plot. The experiment was conducted during the dry season (January-April, 1975) at the Central Experiment Station, University of the Philippines at Los Banos, Laguna. The yielding capacity of grain sorghum (Cosor 3) in terms of its total dry matter,grain yield, and grain tannin concentration was reduced at low light intensyti. The results have shown that: l. Grain sorghum (Cosor 3) yielded differently at different combinations of plants density, nitrogenlevels, and light intensity. 2. Increasing plant population density up to 250,000 plt/ha consistently resulted in reduction of such characters as: leaf length, leaf width, plant height, and number of grains perpanicle. In spite of the depressive effects of dense population on individual plants, grain yield is co compensated by the increase in number of panicles per unit area. Higher plant population density is advantageous only at high light intensity, while at lower light intensity lower plant population is preferred. 3. Fertilized plants matured 10 days earlier than the unfertilized. Plants treated with 150 Kg N/ha produced higher grain yield at higher light intensity. Under shaded condition, grain yields from 75 and 150 Kg N/ha were comparable. 4. Grain tannin concentration was lower at high nitrogen rates. At high light intensity, grain tannin concentration was also high. 5. Leaf nitrate reductase activity was maximum at 25% shade and ao lower nitrogen level. At higher nitrogen rates, maximum nitrate reductase activity was obtained from the unshaded plants.

Download or read book Water Management and Consumptive Use by Irrigated Grain Sorghum in Western Kansas written by Jack T. Musick and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Plant Spacing and Soil Moisture on Growth and Yield of Grain Sorghum written by Satoru Miyata and published by . This book was released on 1978 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Leaf Type Plant Density and Row Spacing on Canopy Architecture and Plant Morphology in Grain Sorghum Sorghum Bicolor L Moench written by Ulysses Daniel Havelka and published by . This book was released on 1971 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microclimate and Transpiration Efficiency in Dryland Crops in Relation to Planting Geometry Growth Stage and Cultivar written by Sushil Thapa and published by . This book was released on 2016 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cultivar selection, planting geometry, and plant population are the key factors determining grain sorghum yields in water deficit areas. When soil resources such as water are non-limiting, uniform cropping will provide the greatest efficiency in light interception and photosynthesis, but when resources are limiting, non-uniform treatment of the land or the crop can be an advantage. A 2-yr sorghum (Sorghum bicolor L. Moench) greenhouse study was conducted to investigate whether clump geometry (three plants clustered) improves microclimate within crop canopy when plants are grown under varying water levels. Plants were grown at two geometries (clump and conventional evenly spaced planting; ESP), two water levels (high and low representing well-watered and drought condition), and three soil surface treatments (lid covered, straw-mulched, and bare surface). Air temperature and relative humidity (RH) within the plant canopy were measured every five minutes at different growth stages. Mean vapor pressure deficits (VPDs) within the clumps were consistently lower than those for ESPs, indicating that clumps improved the microclimate. Clumps had significantly higher harvest index (HI) compared to ESPs (0.48 vs. 0.43), which was largely due to clumps having only 0.4 tillers per plant compared to 1.2 tillers per plant for ESPs. Grain yield was not different between clumps and ESPs. However, results suggest that improved microclimate was likely a reason for clumps producing significantly higher grain yields in previous studies reported in the literature. Corn (Zea mays L.) field studies were conducted in Gruver (Gruver field study, GFS) and Bushland (Bushland field study, BFS), Texas to compare plant canopy temperature, within canopy VPD, grain yield, yield components, and water use efficiency (WUE) for clump (3 plants clustered) and ESP geometries with the same plant populations. At different growth stages for both studies, thermal images were taken for calculating canopy temperature, and temperature and relative humidity within the plant canopy were measured. As a whole, canopy temperatures were significantly lower for clumps compared to ESPs, and mean VPDs within the clumps were consistently lower than those for ESPs, indicating that clumps improved the microclimate. WUE and grain yield showed mixed results, but HI was significantly higher for clumps than that for ESPs in both studies (0.56 vs. 0.54 in GFS and 0.48 vs. 0.45 in BFS). In GFS, plants were grown under three water levels (high, medium, and low). With decreasing irrigation level, canopy temperature and VPD increased and aboveground biomass, grain yield, and HI decreased. Corn plants with medium irrigation level had the highest WUE (1.83 kg m-3) compared to plants at high (1.34 kg m-3) and low (1.22 kg m-3) irrigation levels. Results suggest that growing corn in clumps may be a useful strategy under semi-arid climatic conditions because they improved microclimate, reduced number of tillers, and increased HI with comparable grain yield compared to conventional ESP. Transpiration efficiency (TE) is an important physiological trait in plants for maintaining soil moisture longer and producing high yield with limited water supply. In contrast to other major food crops, little is known about the sorghum TE and its dynamics in relation to environmental VPD. Two simultaneous studies in each of the greenhouse and plant growth chamber were conducted to compare sorghum TE at different growth stages, and to determine the effects of VPD on TE. Plants were grown using lid covered boxes and harvested at six-leaf stage (S1), flag leaf stage (S2), grain filling stage (S3), and grain maturity stage (S4). For all studies, shoot biomass increased linearly with cumulative water used in transpiration. Root biomass increased up to S3 and remained constant thereafter, but shoot biomass as well as shoot: root (S:R) ratio increased consistently from S1 through S4. The overall mean VPDs and shoot transpiration efficiency (TEshoot) for different growth stages were similar within each study. VPDs were different from one study to the other. When data from all studies were combined, ETshoot showed an inverse linear relationship with crop growing period VPD, suggesting that TE decreases as the crop growing period VPD increases. The yield of wheat (Triticum aestivum L.), one of the major crops grown in the Texas High Plains, is mainly affected by drought. Under drought conditions, TE is often considered an important determinant of plant growth and grain yield, which may differ from one cultivar to the other. A greenhouse wheat study was conducted to compare TE among six wheat cultivars namely, Triumph 64 and Scout 66 (released during 1960s), TAM W 101 and TAM 105 (released during 1970s), and TAM 111 and TAM 112 (released after 2000). Plants were grown at high and low water levels with four replications and harvested before anthesis at 62 days after planting. Aboveground dry matter showed a significant linear relationship (P