Interspecific hybridization between Corchorus sidoides F. Muell. and C. siliquosus L., a natural polyploid     

R. M. Datta  S. K. Sen 《Euphytica》1961,10(1):113-119

In Corchorus sidoides F. Muell x C. siliquosus L. , the pod set was 19.05 per cent. and the percentage of pod harvested (out of set pods) was 100 per cent.. All seeds of the cross pods were non-viable.In C. siliquosus L. x C. sidoides F. Muell. , the pod set was 8.7 per cent. and the percentage of pod harvested was 100. In this case the seeds were also non-viable.The genus Corchorus comprises species which are systematically widely related. The possibility of getting viable hybrids in this case is impossible because the phylogenetic relationship does not allow of getting viable seeds. A karyotypic study of these species will throw light on this aspect and breeders will then get a tool for handling this subject.Department of Agriculture, Calcutta University  相似文献   

深施氮肥(¹⁵N标记尿素)对稻田水层化学性质的影响及水稻对深施氮肥的回收率     

曹志洪  S. K. 迪达塔 《土壤学报》1983,20(3):253-261

碳铵粒肥深施是提高氮素回收率,增加水稻等多种作物产量的合理施肥方法之一^[1-4,11].国际稻田肥力和肥料评价纲(INSFFER)在南亚、东南亚等十余个稻产国家的试验表明尿素粒肥深施是增产增收的经济施肥法^[12].  相似文献   

Effect of aggregate size on water uptake by peanut seeds     

A.R. Khan  B. Datta 《Soil & Tillage Research》1983,3(2):171-184

In a lateritic sandy clay loam soil contained in a soil bin, three aggregate size ranges (0.25–0.50, 1.0–2.0 and 2.0–4.0 mm) were established by different tillage intensity to vary the seed—soil contact and to determine the best seedbed for peanut seedling emergence. The general objective was to study the water uptake and diffusivity of the seeds as well as the aeration, water transmission and thermal properties of the seedbed. In the seedbed with the finest aggregate size, the water uptake was maximum and the time needed for germination was least.  相似文献   

Seasonal variations of phenolic compounds in Australia-grown tea (Camellia sinensis)     

Yao L  Caffin N  D'Arcy B  Jiang Y  Shi J  Singanusong R  Liu X  Datta N  Kakuda Y  Xu Y 《Journal of agricultural and food chemistry》2005,53(16):6477-6483

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Maize response to broadcast flaming at different growth stages: Effects on growth,yield and yield components     

Santiago M. Ulloa  Avishek Datta  Chris Bruening  Brian Neilson  Jared Miller  George Gogos  Stevan Z. Knezevic 《European Journal of Agronomy》2011,34(1):10-19

Weed management is a major constraint in organic crop production. Propane flaming could be an additional tool for weed control in organic maize (Zea mays L.) production. However, tolerance of maize to broadcast flaming must be determined first to optimize the use of propane. Field experiments were conducted at the Haskell Agricultural Laboratory of the University of Nebraska, Concord, NE in 2008 and 2009 to determine maize response to five propane doses applied at three growth stages of V2 (2-leaf), V5 (5-leaf) and V7 (7-leaf). The propane doses tested were 0, 13, 24, 44 and 85 kg ha^?1. Flaming treatments were applied utilizing a custom built research flamer mounted on the back of a four-wheeler moving at a constant speed of 6.4 km h^?1. The response of maize to propane flaming was evaluated in terms of visual crop injury (1, 7, 14 and 28 days after treatment—DAT), effects on dry matter (14 DAT), yield components (plants m^?2, ears plant^?1, kernels cob^?1 and 1000-kernel weight) and grain yield. The response of different growth stages of maize to propane doses was described by log–logistic models. Overall, maize response to broadcast flaming varied among growth stages and propane doses. In general, maize at V5 was the most tolerant stage for broadcast flaming, whereas V2 stage was the most susceptible to flaming resulting in the highest visual crop injury ratings, dry matter reductions and the largest loss of yield and its components. At 28 DAT, the maximum visual crop injury rating of 7% was estimated for flaming done at V5 stage compared to significantly higher injuries of 43% and 12% for V2 and V7 growth stages, respectively. An arbitrarily assigned 2.5% yield reduction was evident with 33, 16 and 11 kg ha^?1 of propane for V5, V2 and V7 growth stages, respectively, suggesting that maize flamed at V5 stage can tolerate higher dose of propane for the same yield reduction compared to other growth stages. Moreover, the maximum yield reductions with the highest propane dose of 85 kg ha^?1 were 3% for V5, 11% for V7 and 17% for V2 stage. Based on these results, flaming has a potential to be used effectively in organic maize production when conducted properly at V5 stage. However, there are both benefits and concerns associated with the use of flame weeding. The preservation of the soil from erosion and the protection of the surface and underground water from chemical pollution can be seen as benefits, while the concerns include higher energy use, and the release of greenhouse gasses.  相似文献   

Defining scientific misconduct     

Beasley MR  Datta S  Kogelnik H  Kroemer H  Monroe D 《Science (New York, N.Y.)》2002,298(5598):1554; author reply 1554

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Biomass conversion technologies     

Datta R 《Science (New York, N.Y.)》1981,214(4523):864

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Response surface optimization and artificial neural network modeling of microwave assisted natural dye extraction from pomegranate rind     

Keka Sinha  Papita Das Saha  Siddhartha Datta 《Industrial Crops and Products》2012,37(1):408-414

The extracted dye from brown dry rind of the pomegranate has been used as natural colorant for textiles from ancient times. In this study, microwave assisted extraction (MAE) has been used for extraction for dye from dried pomegranate rind. The effect of three independent parameters namely extraction time (25–90 s), pH of solution (3.5–8) and amount of pomegranate rind (0.5–1.5 g) was considered. Response surface methodology (RSM) is applied to optimize the effects of processing parameters of extraction on the yield of dye and a computer-stimulated artificial neural network (ANN) model is developed to get a good correlation between the input variables responsible for extraction and the output parameter (concentration of dye) of extraction from pomegranate rind. Considering the yield of dye extraction and the feasibility of the experiment, the optimum conditions of dye extraction are extraction time 90 s, pH 3.5, amount of sample 1.48. Application of microwave irradiation method proved to be a rapid and improved technique for dye extraction and significantly reduced the extraction time. The optimization procedure shows a close interaction between the experimental and simulated values for dye extraction.  相似文献   

Impact of different combined doses of fertilizers with plant growth regulators on growth, yield attributes and yield of mustard (Brassica campestris cv. B9) under old alluvial soil of Burdwan, West Bengal, India     

Arnab Banerjee  Jayanta Kumar Datta  Naba Kumar Mondal 《Frontiers of Agriculture in China》2010,4(3):341-351

Field experiments were conducted with mustard (Brassica campestris cv. B₉) consecutively for three years (2005, 2006 and 2007) in the Crop Research and Seed Multiplication Farm of Burdwan University, Burdwan, West Bengal, India. In the first year, varietal screening of mustard under recommended dose of chemical fertilizer (100:50:50) were performed with seven mustard varieties during November 2005 to February 2006. In the second year, two experiments were conducted to study the effects of six different combined doses of chemical fertilizer and biofertilizer and six different levels of growth retardant cycocel. In the third year, six different levels of compost along with the best screened dose of growth retardant (CCC-300 ppm) and the best combined dose of biofertilizer and chemical fertilizer (3/4thchemical fertilizer:1/4th biofertilizer) from the previous year were applied to study the effects on agronomic traits and growth attributes of mustard, and the field data were analyzed statistically. The variety B₉ recorded a significant higher seed yield along with other yield contributing factors, which was found to be superior to other varieties under old alluvial soil of Burdwan, West Bengal, India, in 2005. In 2006 and 2007, seed yield was found to be the best for CCC-300 ppm treatment and the best combined dose of biofertilizer and chemical fertilizer was found to be 3/4th chemical fertilizer:1/4th biofertilizer. In 2007, the best yield was given by the treatment of 7.5 t·hm^?2 compost along with the best dose of growth retardant cycocel and the best combined dose of biofertilizer and chemical fertilizer.  相似文献   

Timing and propane dose of broadcast flaming to control weed population influenced yield of sweet maize (Zea mays L. var. rugosa)     

Santiago M. Ulloa  Avishek Datta  Goran Malidza  Robert Leskovsek  Stevan Z. Knezevic 《Field Crops Research》2010

Farmers are interested to produce sweet maize under organic production systems and propane flaming could be a potential alternative tool for weed control in organic sweet maize production. Therefore, the objective of this study was to investigate the response of sweet maize to broadcast flaming as influenced by propane dose and crop growth stage. Field experiments were conducted at the Haskell Agricultural Laboratory of the University of Nebraska, Concord, NE in 2008 and 2009 using five propane doses applied at three different growth stages of V2 (2-leaf), V5 (5-leaf) and V7 (7-leaf). The propane doses were 0, 13, 24, 44 and 85 kg ha⁻¹. The response of sweet maize to propane flaming was evaluated in terms of visual crop injury, effects on plant height, yield components (plants m⁻², tillers plant⁻¹, number of ears plant⁻¹, cob length and number of seeds cob⁻¹) and fresh marketable yield. The response of different growth stages of sweet maize to propane doses was described by log-logistic models. Based on most parameters tested, V7 was the most tolerant while V2 was the least tolerant stage for broadcast flaming. The maximum yield reductions with the highest propane dose of 85 kg ha⁻¹ were 22%, 12% and 6% for V2, V5 and V7 stages, respectively. Furthermore, a 5% yield reduction was evident with 23, 25 and 36 kg ha⁻¹ of propane for V2, V5 and V7 growth stages, respectively, suggesting that plants flamed at V7 stage can tolerate higher dose of propane for the same yield reduction compared to the other growth stages. We believe that flaming has a potential to be used effectively in organic sweet maize production if properly used.  相似文献