摘要:

Current literature review and discussion of the N status of plants as related to their growth and yield and quality of produced product.

ISSN:0190-4167    

DOI:10.1080/01904167909362704

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The effect of 0.005 ppm, 0.01 ppm, 0.05 ppm and 0.10 ppm zinc on the growth and chemical composition ofDesmodium uncinatumJacq. cv. Silverleaf;Macroptilium lathyroidesL.;Lablab purpureus; andGlycine max. L. cv. Wills were studied in solution culture in a controlled environment room.

ISSN:0190-4167    

DOI:10.1080/01904167909362705

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Alfalfa(Medicago sativaL.) must be fertilized adequately to maintain high herbage yields. The deproteinized alfalfa juice (DAJ) remaining after the protein is extracted from green alfalfa has been used to fertilize alfalfa and other crops, but plant damage has occurred at application depths greater than 1.25 cm. The objective of the current greenhouse studies was to determine the response of alfalfa to fertilization with low and high saponin DAJ, and fertilization with DAJ compared with deproteinized oat(Avena sativaL.) juice (DOJ). The deproteinized plant juices were applied to alfalfa stubble after herbage harvest, and the alfalfa herbage was cut three times each time it reached first flower stage. Alfalfa plants were grown in Piano silt loam (Typic Argiudoll) or in Dodge silt loam (Typic Hapludalf) soil. Yields of alfalfa herbage were not significantly different when low and high saponin DAJ was applied in a single application at the same rate (0.625 cm to 3.75 cm). This also was the case when DAJ was compared with DOJ applied in a single application (1.25 to 3.75 cm), with one exception. At the 2.50 cm rate, alfalfa herbage yields were significantly lower for DAJ than for DOJ. Regardless of the source of depToteinized juice, alfalfa herbage yields were increased over the control with a 1.25 cm application, but were reduced at rates applied in a single application above 2.50 cm., with one exception. At the 2.50 cm rate of DOJ, herbage yields were similar to those of the control. However, yields were increased over the control when 2.50 cm of DAJ or DOJ were applied in a split application. Concentrations of K, Cl, and Mn in first‐harvest alfalfa herbage were increased over the control when the juices were applied, while other elemental concentrations were reduced. It was concluded that source of the deproteinized juice was not the major factor in alfalfa plant damage, but that rate of application was a major factor. Saponins did not appear to be a damaging agent. Plant damage at increased rates may be due to the accumulation of Cl, to a lack of oxygen in the soil, or to unknown phytotoxins contained in the juices or produced from microfloral breakdown products. Further work is needed to confirm which of these is the principal damaging factor.

ISSN:0190-4167    

DOI:10.1080/01904167909362706

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Both Zn and Fe stresses (deficiencies) enhance the uptake of Fe in some plant cultivars but not in others. Release of H+from roots and reduction of Fe3+to Fe2+by roots are two factors enhanced by Fe stress. The objective of this study was to determine if these factors are enhanced more in Zn‐inefficient than Zn‐efficient cultivars. Zn‐inefficient Sanilac and Zn‐efficient Saginaw navy beans (Phaseolus vulgarisL.) were used as test plants. Zinc‐deficiency stress enhanced the Fe‐stress‐response mechanism in both cultivars but more Fe was taken up by Sanilac than by Saginaw. Sanilac developed Zn‐deficiency symptoms, but Saginaw did not. In contrast, Zn toxicity caused Sanilac to develop Fe chlorosis, but Saginaw did not. Zinc toxicity induced Fe‐deficiency‐stress‐response in Saginaw but not in Sanilac. The additional Fe available to Saginaw counteracted some of the toxic effects of Zn. Severity and nature of stress symptoms induced by Zn deficiency or Zn toxicity depend on the plant cultivar.

ISSN:0190-4167    

DOI:10.1080/01904167909362707

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In a mineral nutrient survey, fruits from grapefruit, sweet orange and tangerine trees whose leaves were sampled were analysed for internal quality and then correlated with the respective leaf analysis values. Correlations amongst leaf nutrients were also studied. Statistically significant simple correlations were found between some internal quality parameters and certain leaf nutrients. Due to sampling limitations, a multi‐element consideration in the nature of multiple regression studies was not considered thus limiting the utility of the results in evaluating interionic effects on internal quality of citrus in Sierra Leone.

ISSN:0190-4167    

DOI:10.1080/01904167909362708

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The hypothesis that a relatively high Ca content in the fruit associated with relatively low K/Ca, K/Ca and K + Mg/Ca ratios are indicators of a slow ripening and a delayed senescence has been confirmed by analysing the sound and greenback fruits of two tomato varieties. The elemental changes characterizing a retardation of ripening are associated with the greenback disorder not only in the diseased calyx end of the fruit but also in the apex end where the fruit seems to ripen and colour uniformly.

ISSN:0190-4167    

DOI:10.1080/01904167909362709

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Aluminum effects on plant growth and the mineral compositions and uptake of different cultivars of triticale (X Triticosecale, Wittmack), wheat(Triticum aestivum L.), and rye(Secale cereale L.)were determined in 1/5 strength Steinberg solution. The plants were grown in solutions containing 0 or 6 ppm for 15 and 32 days, respectively. The objective was to determine whether the concentrations and uptake of Zn, Fe, Mn, and Cu separated cultivars according to their degrees of Al tolerance at different growth stages. The effects of Al on mineral levels in plants varied with plant age. For example, Al generally decreased the mineral concentrations at 15 days and sometimes in plant tops at 32 days. However, the Zn and Mn in triticale 6TA 203, Al‐tolerant wheats, and the rye cultivars were increased by Al at 32 days. Aluminum tolerance in triticale and wheat was characterized by high Zn and Mn concentrations and uptake in roots, when grown in solutions containing Al. High degrees of Al tolerance were also associated with low root Cu and top Fe concentrations in triticale and high Cu concentrations in tops and low levels of Fe in wheat. Zinc and Mn were also more translocated from roots to tops than Fe and Cu. However, Al stress reduced the absorption and trans‐location of all the elements. The concentrations of Zn, Fe, Mn, and Cu in tops of the rye cultivars were increased by Al and the mineral levels were not consistently related to the degrees of Al tolerance of the ryes.

ISSN:0190-4167    

DOI:10.1080/01904167909362710

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904167909362703

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor