摘要:

Field experiments were conducted to determine the effect of planting date and cultivar on B, Zn, Mn, Fe, Mg, and Ca content of soybean leaflets, petioles, and stems at beginning bloom (R1), beginning seed (R5) and physiological maturity (R7) growth stages. The concentrations of all the nutrients analyzed were influenced by planting date and cultivar in at least one year. The concentration ranges were: B, 16–167 ppm; Zn, 14–98 ppm; Fe, trace‐575 ppm; Mn, 12–122 ppm; Mg, 0.18–0.89%, and Ca, 0.47–3.02%. As the plants developed, [Fe] generally decreased, [Mn] increased, and [Zn] showed no consistent response. Changes in B, Mg, and Ca concentrations with plant development varied with the plant part. Leaflet [Ca] and [B], and petiole [Ca] and [Mg] increased during seedfill. Petiole and stem [B], and stem [Mg] and [Ca] decreased during seedfill.

ISSN:0190-4167    

DOI:10.1080/01904168709363562

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Aluminum tolerant oat cultivars are needed for use on acid soil sites where neutralization of soil acidity by liming is not economically feasible. Oat germplasm in Poland has not been examined for range of Al tolerance. Eleven Polish oat cultivars were screened for Al tolerance in nutrient solutions containing 0, 5 and 15 mg L‐1Al. Three of these cultivars showing high to moderate tolerance to Al in nutrient solutions were also grown in greenhouse pots of soil and in field plots of soil over a pH range of 3.8 to 5.5 as determined in 1NKC1.

ISSN:0190-4167    

DOI:10.1080/01904168709363563

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The growth and elemental composition of various parts of cauliflower (Brassica oleraceavarbotrytiscv White Top) plants were investigated under greenhouse conditions with plants grown in vermiculite medium as a function of B added at concentrations of 0.0, 0.25, 1.0, 2.5 and 12.5 mg L‐l. Optimal plant and head yield, and the maximum fresh weight harvest index were found at 1.0 mg B L‐l; B levels in the head, and old and young leaves were 41, 543 and 145 μg g‐1DM respectively. Above and below 1.0 mg B L‐lfoliar symptoms of toxicity and deficiency were evident. In the absence of added B, the head also showed slight internal signs of necrosis and browning, and curd surface discoloration, symptoms which may be associated with the hollow stem disorder under field conditions. In this case, the B levels were 21, 35, 48 and 55 μg g‐1DM respectively in the head, and old, young and intermediate leaves. Comparison of the relative element composition of younger tissues to old leaves indicated that the former, particularly the head, were supplied with nutrients principally by the phloem and that B was relatively phloem‐immobile. However, indirect assessment of element retranslocation, based on the ratio of its concentration in young leaves or head: old leaves, showed that B is remobilized under B deficiency. The B concentration of the nutrient solution also caused changes in the retranslocation of other elements, particularly the largely phloem‐immobile elements, to young leaves. It is concluded that the B levels of the old leaves, and the young tissue, particularly the head are respectively the most reliable indicator of B toxicity and deficiency.

ISSN:0190-4167    

DOI:10.1080/01904168709363564

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Information about plant responses to different sources of phosphorus (P) is limited. Sorghum [Sorghum bicoior(L.) Moench] genotypes were grown with low levels of organic and inorganic sources of P in nutrient solution and soil to determine the availability of P from different P compounds and to note genotype differences for dry matter yield and P uptake. Plants grown in nutrient solution and soil with organic sources of P (ethylammonium, glyceryl, and phenyl phosphates) produced more dry matter and had higher P contents than plants grown with inorganic sources of P [potassium dihydrogen, calcium (tribasic and pyro), ferric, and aluminum phosphates]. Plants grown with the inorganic sources of P had higher P efficiency values (dry matter produced per unit P taken up) than plants grown with organic sources of P. Phosphorus from organic compounds appeared to be more readily available to sorghum plants than P from inorganic compounds. Of the inbred genotypes studied, NB9040 was the most responsive and SC33–9‐8‐E4, TX415, and CK60‐Korgi were the least responsive to low P.

ISSN:0190-4167    

DOI:10.1080/01904168709363565

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The influence of different amounts and durations of NaCl salination of the nutrient solution on the net photosynthesis rate and the assimilate transport was studied for soybeans. In vivo measurements on the short‐time kinetics of the assimilate‐root transport were made with the short‐lived C isotope. Moderate salt stress (60 mM NaCl), with decreasing the photosynthesis rate after 7 days of treatment, did not show any influence on the assimilate transport to the main sink the root. A clear depression was observed shortly after applying a stronger salt concentration (90 mM NaCl). Stress lasting for several days at the same concentration showed a reduced photosynthesis rate, but after the plant had adapted the depression on the radioactivity translocated to the root was much reduced. A high, almost toxic salt concentration (120 mM NaCl) resulted in a drastically reduced photosynthesis rate with a similarly irreversibly restricted and time‐delayed transport rate of labelled assimilates to the root. Even with this severe salt stress in the root medium, the photosynthesis rate was not influenced in the short term.

ISSN:0190-4167    

DOI:10.1080/01904168709363566

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In field experiments on three different locations it was looked for indicators inducing iron chlorosis on grape‐vines grafted on two rootstocks: Couderc 3309 (susceptible) and Kober 5 BB (resistant). Investigating the soil it was found that the bicarbonate concentration in the rooted soil depth (20–60 cm) did not differ between chlorotic plants and the green ones, whereas the phosphate concentration under chlorotic plants is significantly higher. There exists no differences in the iron content of the soil.

ISSN:0190-4167    

DOI:10.1080/01904168709363567

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In pot experiments the influence of bicarbonate and phosphate on the upset of chlorosis in grapevine grafted on two rootstocks with different Fe‐efficiency was studied. Grapevine grafted with the susceptible rootstock showed severe symptoms of chlorosis in the bicarbonate trials, while those on Fe‐efficient rootstock remained green during the whole experiment. Bicarbonate reduced the iron concentration in both the leaves and stems of the susceptible plants, but not in the resistent ones.

ISSN:0190-4167    

DOI:10.1080/01904168709363568

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904168709363561

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor