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V. Slipevi I. Vedrina-Dragojevi L. Balint J. Momirovi-uljat 《Journal of Agronomy and Crop Science》1992,168(2):73-84
Dynamics of the cumulation of phosphorus, potassium, calcium and magnesium in developing seed of four soybean genotypes under the defined climatic conditions in the course of three years was observed. Samples were being taken at weekly intervals from the point at which the grain reached a size suitable to be analyzed up to the full maturity of the seed. By analyzing the results it was found out that the intense cumulation of the minerals tested took place during the stages III and IV of the seed development, that is, in the course of intense cumulation of dry matter and the most expressive metabolic activity in the seed. Investigation of the impact of climatic conditions provides evidence that cumulation of the tested macroelements has been favourably influenced by increased precipitation along with moderate air temperatures within the seed developing period. The highest content of the minerals found with the cultivar Maksimirka independently of the year investigated reveals that mineral cumulation in soybean seed is affected by the cultivar and genetic particularity. 相似文献
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Abstract. Recent developments in in situγ ray spectrometry offer a new approach to measuring the activity of radionuclides such as 137Cs and 40K in soils, and thus estimating erosion or deposition rates and field moist bulk density (ρm). Such estimates would be rapid and involve minimal site disturbance, especially important where archaeological remains are present. This paper presents the results of a pilot investigation of an eroded field in Scotland in which a portable hyper pure germanium (HPGe) detector was used to measure γ ray spectra in situ. The gamma (γ) photon flux observed at the soil surface is a function of the 137Cs inventory, its depth distribution characteristics and ρm. A coefficient, QCs, derived from the forward scattering of 137Cs γ ray photons within the soil profile relative to the 137Cs full energy peak (662 keV), was used to correct the in situ calibration for changes in the 137Cs vertical distribution in the ploughed field, a function of tillage, soil accumulation and ρm. Based on only 8 measurements, the agreement between in situγ ray spectrometry and soil sample measurements of 137Cs inventories improved from a non significant r2=0.05 to a significant r2=0.62 (P<0.05). Erosion and deposition rates calculated from the corrected in situ137Cs measurements had a similarly good agreement with those calculated from soil cores. Mean soil bulk density was also calculated using a separate coefficient, QK, derived from the forward scattering γ photons from 40K within the soil relative to the 40K full energy peak (1460 keV). Again there was good agreement with soil core measurements (r2=0.64; P<0.05). The precision of the in situ137Cs measurement was limited by the precision with which QCs can be estimated, a function of the low 137Cs deposition levels associated with the weapons testing fallout and relatively low detector efficiency (35%). In contrast, the precision of the in situ ρm determination was only limited by the spatial variability associated with soil sampling. 相似文献
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本文对福建省官庄林场杉木第二代种子园自由授粉子代试验林树高、胸径和材积等生长性状进行了研究。子代测定结果表明,参试家系间的效应显著;利用方差分析的结果,估算了杉木树高、胸径和材积的家系遗传力和单株遗传力,并以10%、20%的选择强度估算出杉木的遗传增益值。通过分析得出杉木各生长性状间有较高的相关性。依材积选择出46个优良家系,用作造林,4年生时估计其遗传增益可达41.37%~51.37%。 相似文献
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在市场经济迅速发展、种子生产、流通量不断增加和加入WTO的新形势下,充分提高湖南省棉种的质量水平,推动棉种产业化的健康发展,对农民增收、农村稳定具有重大的现实意义。本文简要介绍了提高湖南棉种质量水平的紧迫性和可行性。在此基础上提出了提高棉种质量水平促进产业化发展的几点建议。 相似文献
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芝麻的核型与系统演化 总被引:1,自引:0,他引:1
对10份粒色不同的栽培和野生芝麻的染色体组型研究表明,栽培芝麻染色体数目一致,核型基本相同:2n=26=12m+12Sm+2St随着粒色的变浅,核型的不对称性加强,有两对随体染色体。野生芝麻核型与栽培芝麻相似:2n=26=12m+12Sm(4SAT)染色体数目有2n=26,2n=32,2n=58或2n=64.芝麻可能是由对称核型向不对称核型演化,其趋势为:野生(2n=26)-黑粒-褐袜-黄粒-白粒 相似文献
40.
平潭县燕下埔沙荒风口综合治理试验初报 总被引:1,自引:0,他引:1
对燕下埔沙荒风口地段的综合治理试验结果表明:风口造林要取得成功,除了要采取必要的生物措施,更为重要的是应设置具有一定疏透度的风障以降低风沙危害,提高造林成活率。 相似文献