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Accumulated heat unit and phenology of diverse maize varieties as affected by planting dates under Rampur condition, Nepal  [PDF]
LP Amgain
Agronomy Journal of Nepal , 2011, DOI: 10.3126/ajn.v2i0.7526
Abstract: Accumulated heat unit and phenology of a full season open pollinated and three specialty corn (Zea mays L.) cultivars (Hybrid, QPM and Pop) were studied by growing them on three different planting dates (September 1, October 1 and November 1) in RCB design at Rampur Chitwan, Nepal during the winter season of 2009-10. The results indicated that the number of days required to attain different phenological stages were short for the early winter and gradually long for late winter plantings. For all the phenological studies, plants of normal sowing condition (September 1) recorded comparatively higher heat units than the late planting (October 1 and November 1) for all cultivars. Both early and late plantings recorded the higher helio-thermal units at advanced growth phases than at the early stages. The pheno-thermal indices at the earlier growth stages were significantly higher for early planting than the late plantings. The heat use efficiency (HUE) was found to be higher under normal planting as compared to the late plantings. Popular maize variety Rampur Composite was found to be the most suitable to produce stable HUE than the other varieties tested. The specialty corn cultivars could not show stable yield in late planting conditions suggesting their planting could be better for September sowing during early winter seasons. DOI: http://dx.doi.org/10.3126/ajn.v2i0.7526 Agronomy Journal of Nepal (Agron JN) Vol. 2: 2011 pp.111-120
Effects of Sowing Dates on the Phenology, Seed Yield and Yield Components of Peas
A. B. Siddique,D. Wright,S. M. Mahbub Ali
Journal of Biological Sciences , 2002,
Abstract: This experiment was conducted to test a range of sowing dates, between 01.03.99 and 07.06.99 and in this way covering a wide range of environmental situations. Seed yield, yield component and different development periods of peas were measured. It was found that seed yield generally decreased in delayed sowing. Decrease of yield in delayed sowing was due to decreases in all yield components. The effects were significant for number of seeds per m2, number of seeds per plant and number of seeds per pod but not for number of pods per m2 and per plant.
Effects of Sowing Dates on the Phenology, Seed Yield and Yield Components of Flax  [PDF]
A. B. Siddique,D. Wright,S. M. M. Ali,A. F. Mollah
Journal of Biological Sciences , 2002,
Abstract: This experiment was conducted to test a range of sowing dates, between 01.03.99 and 07.06.99 and in this way covering a wide range of environmental situations. Seed yield, yield component and different development periods of flax were measured and compared. It was found that seed yield generally decreased by delayed sowing. The effects were significant for number of seeds per m2, number of capsules per plant, number of seeds per plant and number of seeds per capsule but not for number of capsules per m2
Simulation Study of past Climate Change Effect on Chickpea Phenology at Different Sowing Dates in Gorgan, Iran  [PDF]
M. Gholipoor,S. Shahsavani
Pakistan Journal of Biological Sciences , 2008,
Abstract: This simulation study was mainly aimed to find the probable difference between sowing dates for response of four chickpea cultivars to past climate change. Firstly, the model CYRUS was recoded in QBASIC programming. Then phenology of cultivars Jam, Hashem, Arman and Beauvanij, seeded at day of year 50, 70 and 90, was evaluated during years 1961 to 2003 in Gorgan, Iran. The changes in some climatic variables were also studied. Results revealed that the solar radiation has been decreased for month December. Although the value of maximum temperature appeared to be the same across years 1961 to 2003 for all months, that of minimum temperature tended to show increasing trend for May and August. The increase in number of days with temperature higher than 35 °C was considerable for April and October, but negligible for other months. The warming of night temperature was significant only for May and August. It found about 34 mm per 43 years decrease in monthly rainfall for March. The rate of increase in number of days with rainfall was 0.0737 day per year for December. Nearly similar situation was found for number of days with rainfall lower than and/or equal to 10 mm. The change in number of days with rainfall higher than 10 mm and lower and/or equal to 30 mm was in decreasing manner (March, October and December). The length of time from sowing to emergence appeared to be constant across past years. The advance in flowering (R1) was true only for cultivar Jam seeded at day of year 70. The length of period from R1 to pod initiation (R3) has been diminished for sowing at day of year 70 (Jam and Arman). Only cultivar Hashem seeded at day of year 90 tended to have decreasing trend for length of period between R3 and pod filling. It found one day (per 43 years) decreases from pod yellowing to maturity for cultivar Beauvanij seeded at day of year 70. Based on these findings and on the fact that future climate change is predicted using past changes, it seems that the adaptation strategies for future, including agronomy and/or breeding programs, may be not the same for different sowing dates of chickpea.
Influence of Different Irrigation Regimes on the Phenology and Accumulated Heat Units in Four Bread Wheat Cultivars
M.Z. Alam,S.A. Haider,N.K. Paul
Pakistan Journal of Biological Sciences , 2004,
Abstract: A field investigation was carried out to study the influence of irrigation on phenology and accumulated heat units of four cultivars of bread wheat (Triticum aestivum L.) at different phenological stages over two growing seasons. There were three treatments: rainfed, 10 and 20 mm irrigation. The rainfed plants had significantly shorter phenological stages and lower growing day degree than the irrigated plants in all the four cultivars. Cultivars Akbar was found to be early and C 306 was found to be late maturing. Akbar had the lowest and C 306 had the highest growing degree days during all the phenological stages under each irrigation regime. Heliothermal units also showed more or less the same trends. The phenothermal indices and heat use efficiency were found to be higher in the irrigated plants than the rainfed plants.
Response of Wheat Varieties to Sowing Dates  [PDF]
M. Aslam,Manzoor Hussain,M. Akhtar,M.S. Cheema
Journal of Agronomy , 2003,
Abstract: The study was conducted to evaluate the appropriate sowing time of newly evolved wheat varieties/cultivars under Bahawalpur conditions. The study included 6 sowing dates started form Ist November up to 15th January of year 1999-2000 to 2000-2001 with equal intervals of fifteen days and five varieties/cultivars viz., 2236, 2098, 2219 punjnad-1 with inqlab, 91 as standard one. Regardless of varieties/cultivars the best results were obtained when wheat was sown after Ist and before 15th November of year 1999 to 2000. However wheat variety punjnad-1 gave significantly higher weights in a wide range of sowing period i.e., Ist to 30th November. The highest mean grain yield of 5315 kg ha-1 was obtained when crop was sown on 15th November (D2) followed by 5268 kg ha-1 for sowing on Ist November (D1).
Responses of Wheat Genotypes as Affected by Different Sowing Dates
F. Aslani,M.R. Mehrvar
Asian Journal of Agricultural Sciences , 2012,
Abstract: A field experiment was conducted Seed and Plant Improvement Institute, Karaj (Iran) for two seasons, 2007-08 and 2008-09, on farmer’s fields to investigate the effect of two sowing dates; optimum sowing date (1st November) and late sowing date (20th November) on yield and yield components of eight wheat genotypes. The results showed that the optimum sowing produced higher grain and biomass yields, 1000- grain weight, Spike per square meter compared to late sowing. Between grain yield and traits of biological yield, 1000- grain weight and grain per square meter were correlated positively.
Effects of different sowing dates on yieid and protein content of spring wheat
不同播期对春小麦产量及蛋白质含量的影响研究

SUN Yan-Kun,FU Qiang,WANG Hong-Yan,
孙彦坤
,付 强,王宏燕

中国生态农业学报 , 2003,
Abstract: The effects of different climate factors on the develo pm ent, yield, and quality of wheat in different sowing dates are studied. The resu lts show that the suitable sowing period of spring wheat is in the middle of Apr il. Sowing in this time, the yield and protein contents of the spring wheat will be increased markedly.
Effect of Sowing Dates on the Yield and Yield Components of Different Wheat Varieties  [PDF]
Wajid Ali Shah,Jehan Bakht,Tehseen Ullah,Abdul Wahab Khan
Journal of Agronomy , 2006,
Abstract: To study the effect of sowing dates on the yield and yield components of different wheat varieties an experiment was conducted at Malakandhar Research Farm of NWFP Agriculture University Peshawar during 1999-2000. Statistical analysis of the data revealed that different dates sowing and varieties had a significant effect on emergences m-2, number of productive tillers m-2, number of unproductive tillers m-2, spike length, grain yield and biological yield. While number of unproductive tillers m-2, days to heading and biological yield were significantly affected by interaction between different sowing dates and varieties. Mean value of the data revealed that emergence m-2 (179). spike length (11.33 cm). grain yield (3611.11 kg ha-1) and biological yield (10370.00 kg ha-1) was maximum in those plots which were sown on November 1st when compared with other sowing dates. Similarly variety Tatara-96 recorded maximum emergence m-2, days to heading, number of productive tillers m-2, spike length and grain yield when compared with other varieties under study.
Yield and Yield Components of Various Wheat Cultivars as Affected by Different Sowing Dates  [PDF]
Khurram Shahzad,Jehan Bakht,Wajid Ali Shah,Muhammad Shafi
Asian Journal of Plant Sciences , 2002,
Abstract: An experiment was conducted to study the yield and yield components of various wheat cultivars as affected by different sowing dates. Statistical analysis of the data revealed that different date of sowing and varieties had a significant effect on days to maturity, 1000 grain weight, grains spike -1, grain yield, biological yield and harvest index. While plant height, days to maturity, grains -1, 1000 grain weight, grain yield and biological yield was significantly affected by interaction between different sowing dates and varieties. Mean value of the data revealed that plant height (106 cm), grains -1, 1000 grain weight (75.20 g), grain yield (3611.11 kg ha -1) and biological yield (10370.00 kg ha -1) was maximum in those plots which were sown on November 1st when compared with other sowing dates. Similarly variety tatara-96 recorded maximum plant height, grains -1, 1000 grain weight, grain yield and harvest index when compared with other varieties under study.
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