排序方式： 共有40条查询结果，搜索用时 20 毫秒
1.
Two field experiments (Experiment I in 2003–2005 and Experiment II in 2004–2005) with carrot c.v. ‘Kazan F1’ were conducted at Trzciana village (50°06′N, 21°85′E). The experiments were arranged in a split-plot design with four replications. Two sub-blocks were identified in both experiments: I, without foliar nutrition; II, receiving plant foliar nutrition. The plants were sprayed three times alternately with: 2% urea solution, 1% solution of multi-component ‘Supervit R’ fertilizer (produced by Intermag, Poland) and again with 2% urea solution. Combinations with diversified nitrogen fertilization were distinguished within both sub-blocks. Experiment I comprised of: (1) Control, (2) Ca(NO3)2 70, (3) Ca(NO3)2 70 + 70, (4) (NH4)2SO4 70 and (5) (NH4)2SO4 70 + 70. Experiment II included: (1) Control, (2) ENTEC-26 35 + 35, (3) ENTEC-26 70 + 70, (4) ENTEC 26 105 + 105, (5) NH4NO3 35 + 35, (6) NH4NO3 70 + 70, (7) NH4NO3 105 + 105. Where 70 kg N ha−1 was used before sowing, whereas 35 + 35, 70 + 70 and 105 + 105 kg N ha−1 were applied before sowing and as top dressing. Solid nitrogen fertilizer was added to the soil (produced by): Ca(NO3)2, Yara International ASA (Hydro); (NH4)2SO4, Zak?ady Azotowe in Tarnów, Poland; NH4NO3, Zak?ady Azotowe in Pu?awy, Poland; and ENTEC-26, COMPO GmbH & Co. KG, Germany. The research aimed at determining the effect of diversified nitrogen fertilization and foliar nutrition on NO3−, NH4+, N-total and dry matter (d.m.) concentrations in carrot, and N uptake by storage roots. In Experiment I, nitrogen fertilization did not affect NO3− concentration, whereas in Experiment II, the applied N treatment increased NO3− concentration in carrot in relation to the control, except for the storage roots of plants fertilized with ENTEC-26 35 + 35. Nitrogen fertilization applied in both experiments caused a significant increase in N-total concentration in carrot and N uptake by storage roots in comparison with the control plants. In both experiments, nitrogen fertilization had a different effect on the concentrations of NH4+ and d.m. in carrot. What is more, foliar nutrition treatments in both experiments had a different effect on the concentrations on NO3−, N-total, d.m. in carrot and N uptake by carrot storage roots. 相似文献
2.
Dorota Miliszkiewicz Piotr Wieczorek Barbara Lejczak Ewa Kowalik Pawel Kafarski 《Pest management science》1992,34(4):349-354
Phosphonic and phosphinic acid analogues of glutamic and aspartic acids were synthesized and screened for herbicidal activity on Lepidium sativum L. Depending on the chemical structure, they exhibited significant or moderate herbicidal activity against L. sativum roots (with some representatives being equipotent with phosphinothricin), while their influence on shoot growth was negligible. Cucumis sativus L. appeared to be more tolerant to these analogues. The origin of this selectivity remains to be determined. 相似文献
3.
4.
To forecast the suitability of land for winter wheat, soil investigations were directed towards the evaluation of the effect of drainage conditions on productivity. Experiments were carried out on two soil types in Mugello (Italy): a well-drained soil and a poorly drained soil. Measurements of plants, atmosphere and water-table data were taken to simulate soil water contents and yields according to the model of Feddes et al. (1978). Computed and measured soil water contents and yields showed good agreement. On the poorly drained soil, root development was limited by the groundwater table and the final productivity, expressed as dry biomass, resulted in a 50% yield depression compared with that on the well drained soil. 相似文献
5.
The effect of relaxing massage on heart rate and heart rate variability in purebred Arabian racehorses 
下载免费PDF全文
下载免费PDF全文 Sylwester Kowalik Iwona Janczarek Witold Kędzierski Anna Stachurska Izabela Wilk 《Animal Science Journal》2017,88(4):669-677
The objective of this study was to assess the effect of relaxing massage on the heart rate (HR) and heart rate variability (HRV) in young racehorses during their first racing season. In the study, 72 Purebred Arabian racehorses were included. The study was implemented during the full race season. The horses from control and experimental groups were included in regular race training 6 days a week. The horses from the experimental group were additionally subject to the relaxing massage 3 days a week during the whole study. HR and HRV were assumed as indicators of the emotional state of the horses. The measurements were taken six times, every 4‐5 weeks. The HRV parameters were measured at rest, during grooming and saddling the horse and during warm‐up walking under a rider. The changes of the parameters throughout the season suggest that the relaxing massage may be effectively used to make the racehorses more relaxed and calm. Moreover, the horses from the experimental group had better race performance records. 相似文献
6.
7.
The goal of these studies was to evaluate the influence of tuber age on the expression of resistance to Phytophthora infestans in five selected potato genotypes (three cultivars and two clones) varying in tuber resistance and maturity type, and also
to select the best time for testing potato tubers for resistance to blight. Resistance was evaluated by inoculating whole
tubers at 13 different times as they progressively aged during growth and storage. Tuber age was expressed as weeks after
planting. Tubers were rated from week 13 (late July) until week 43 (late February) for tubers planted on 27–28 April, over
three consecutive seasons (2001–2003). Analysis of variance performed on tuber resistance data showed significant effects
of genotype, year and tuber age. Significant contributions of genotype × year, genotype × tuber age, year × tuber age and
year × genotype × tuber age interactions were also detected. A slight increase in tuber resistance with tuber age was observed
for cvs Bzura, Sokół and Irga, while the opposite trend was observed for the clones 97-A-63 and DG 92-227. Changes in tuber
resistance with age of tested genotypes were not related to their maturity type. The period of most stable expression of tuber
resistance was observed when tubers were tested between the 16th and 28th week after planting. 相似文献
8.
In 2006–2007 small radish was cultivated in a pot experiment. Foliar applications were applied twice with solutions of the following compounds: 1) control (water); 2) urea; 3) urea+molybdenum (Mo), 4) urea+Mo+benzyladenine (BA); 5) urea+Mo+BA+sucrose; 6) urea+Mo+BA+sucrose+salicylic acid (SA), 7) BA; 8) SA; and 9) sucrose. The above solutions contained following concentrations of compounds: urea 20 g dm?3, sucrose 10 g dm?3, Mo 1 mg dm?3, BA 5 mg dm?3 and SA 10 mg dm?3. In comparison with the control, spraying plants with the solution of urea+Mo+BA+sucrose and SA only caused an increase in leaf mass of one plant. Foliar applications did not have any effect on the yield of edible roots. When compared with the control, the use of sucrose resulted in a decreased content of nitrate (V) in leaves, while the application of urea+Mo+BA+sucrose led to elevated content of nitrate (V) in roots. In case of spraying plants with solutions containing urea (combinations no. 2–6) there was a tendency to increase ammonium (NH4 +) and nitrogen (N)-total content in leaves and roots, and increase in N uptake by leaves and by the whole plant but not by the radish roots. In combinations 7–9 we noted a decline in the level of ascorbic acid, and in combinations 2–6 there was a decrease in the content of soluble sugars in roots. In comparison with the control, an increase was observed in combinations 2 and 3, while in combinations 7–9 a decrease in the content of free amino acids in roots was observed. None of the combinations with foliar application caused any significant changes in the content of assimilative pigments in radish leaves and concentration of nitrate (III), dry matter in leaves and roots, the content of phenolic compounds, content of potassium (K), magnesium (Mg), calcium (Ca) extracted with 2% acetic acid in roots as well as free radical activity of radish roots. 相似文献
9.
Roman Gancarz Witold Wielkopolski Elbieta Jaskuska Pawel Kafarski Barbara Lejczak Przemyslaw Mastalerz Jan Sylwester Wieczorek 《Pest management science》1985,16(3):234-238
9-Aminofluoren-9-ylphosphine oxides and the corresponding 9-hydroxy analogues were synthesised and evaluated for herbicidal activity using Spirodela oligorrhiza (Kurz.) Hegelm. All the test compounds were highly active at concentrations of about 10 μM and were comparable with the corresponding phosphonic esters. 相似文献
10.
Barbara Lejczak Pawel Kafarski Roman Gancarz Elzbieta Jaskulska Przemyslaw Mastalerz Jan Sylwester Wieczorek Marta Krl 《Pest management science》1985,16(3):227-233
Peptides of 9-aminofluoren-9-ylphosphonic or 1-aminocyclohexylphosphonic acids were synthesised and found to have typical morphactin activity when tested on Lepidium sativum and Triticum vulgare. The observed effects included root elongation with simultaneous stem shortening. The results obtained indicate that these phosphonic acid derivatives of cyclohexylamine and fluoren-9-ylamine may have a similar mechanism of action. 相似文献