摘要:

The perennial legume, Winged Bean (Psophocarpus tetragonolobus(L) DC), has potential as a high protein food crop for the humid, tropical regions of the world. Edible seed pods, oil seed grain, leaves, flowers, and unique high protein tubers provide abundant nutritious components desirable for improved human diets. However, soil characteristics and fertility levels influence plant growth, yields and nitrogen fixation capability of this legume. Objectives of this study were to determine soil‐plant nutrient influences on vigorous regrowth, pod and tuber yields, nitrogenase (C2H2red.) activity levels, and nodule cytosol components of the perennial Siempre cultivar grown on a Typic Eutrustox during three years, 1978–1980.

ISSN:0190-4167    

DOI:10.1080/01904168309363132

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The effects of ambient acidity on NO3−and Nh4+absorption by 26‐day‐old tomato plants (Lycopersicon esculentumMill.) were examined in solution culture. The absorption rate per unit root mass was measured for 6 hr. The NO3−absorption rate from 0.4 mM NaNO, was 36% greater at pH 4.5 than at pH 6.5. In contrast, the NhY absorption rate was approximately 42% greater at pH 5.5 or 6.5 than at pH 4.5. The presence of equimolar NHr from 0.4 mM NH^NO, decreased the NO, absorption rate at pH 5.5 or 6.5 but did not reduce the rate at pH 4.5. The NO, absorption rate was inhibited less at pH 5.5 when equimolar NHr was supplied from 0.2 mM (NH4)2S04as opposed to NH4NO3. At pH 5.5, the N03−absorption rate increased with increased #OPNH4#CP2SO4concentration. The presence of equimolar NO3−supplied as either NaNO3or NH4NO3had no effect on the NH4+absorption rate at pH 5.5 or 6.5. However, at pH 4.5, the NH4+absorptionratewas slightly reduced from NH4NO3solutions relative to that from a (NH4)2S04solution.

ISSN:0190-4167    

DOI:10.1080/01904168309363133

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Various glues and adhesives were tested for their ability to remove the unabsorbed residue from drops of foliar applied radioactive nutrients toFicus benjaminaL. andGlycine maxMerr. Most glues/adhesives adequately removed the unabsorbed residue from nutrients that dried forming a salt deposit on the leaf surface, but only 1.6–3.2% agar, Rhoplex 33, and Elmers Glue removed greater than 95% of the residue from nutrients that formed a moist hygroscopic residue on the leaf surface. Adding 25 mM KH2PO4to 3.2% agar, followed by swabbing the treated area with lN HCl‐1% Liquinox detergent removed all unabsorbed residue from monovalent and divalent cationic an anionic nutrients including heavy metals. Methods to assay foliar absorption were compared by applying “Rb phosphate to leaves of intact plants, excised leaves and leaf discs. Excised leaves with their petiole or stem bases in water behaved similar to intact plants, whereas excised leaves or discs maintained in in a moist atmosphere behaved atypically due to slower and incomplete drying compared to intact plants.

ISSN:0190-4167    

DOI:10.1080/01904168309363134

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The influence of soil temperature on nutrient accumulation in aerial portions of sorghum plants was evaluated in a greenhouse experiment. Plants were grown in 20‐liter containers at cooled and ambient soil temperatures of 20 and 25C, respectively, and were harvested at the 8‐ and 12‐leaf stages of development for yield and nutrient analysis.

ISSN:0190-4167    

DOI:10.1080/01904168309363135

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A yellow‐fruited inbred pepper cv. ‘Zehavi’, was found to be highly chlorotic on a previously non‐cultivated calcareous soil in the Arava Valley (Israel) during winter 1981–1982. Foliage symptoms and a test for diagnosing iron indicated iron deficiency, soil application of Fe EDTA corrected the symptoms in the field. When ‘Zehavi’ was sown at the same location, in the winter of 1982–1983, but on calcareous soil which had previously been cultivated for several years, no chlorosis appeared. Inheritance studies indicated recessive control for iron deficiency chlorosis but complete genetic interpretation is suggested only under controlled iron deficiency conditions.

ISSN:0190-4167    

DOI:10.1080/01904168309363136

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Effect of calcium and magnesium on zinc absorption by 21‐day‐old rice seedlings and its translocation within the plants was studied in the nutrient solution culture using radioactive zinc. The concentrations of the elements in the nutrient solution were 0.5, 1.0 and 2.0 μM zinc and 0, 10 and 20 mM calcium and magnesium. Absorption of65zinc was studied for 30, 60 and 90 minutes and translocation for 24 hours. Zinc absorption increased with time and increased zinc concentration in the nutrient solutions. Addition of calcium and magnesium reduced zinc absorption by rice seedlings by about 60 and 90% respectively at a concentration of 20 mM. The nature of inhibition of both calcium and magnesium on zinc was non‐competitive as indicated by Michaelis constants. A large fraction of zinc absorbed remained in roots and only 5.3% was translocated to shoots even at 2.0 #GMM zinc concentrations in solution. The effect of cations on translocation of65zinc within rice seedlings was more at lower( 0.5 μM zinc) than at higher (2.0 μM zinc) concentrations.

ISSN:0190-4167    

DOI:10.1080/01904168309363137

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This research deals with the effects of exogenous growth regulators on mineral nutrition of the tomato plant(Lyeopersieon esaulentumMill. cv. Miguel Pereira). To study the influence on mineral nutrition, (2‐chloroethyl) trimethylammonium chloride (CCC) , at concentration of 2,000 ppm, succinic acid‐2, 2‐dimethylhydrazide (SADH) (4,000 ppm), gibberellic acid (GA) (100 ppm), (2‐chloroethyl) phosphonic acid (CEPA) (200 ppm), indole‐3‐acetic acid (IAA) (100 ppm) and 6‐furfurylamino purine (FAP) (500 ppm) were applied. Higher levels of nitrogen, calcium and magnesium occurred in the stem of plants sprayed with CCC. Treatments with FAP, SADH and CEPA caused an increase in nitrogen level in the stem. CEPA also increased calcium content in stems. These growth regulators did not alter the levels of macronutrients in the leaves in relation to control.

ISSN:0190-4167    

DOI:10.1080/01904168309363138

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Two Ca‐efficient and 3 Ca‐inefficient tomato strains were grown for 18 days in nutrient solutions with NH4‐N:NO3‐N ratios(%)of 0:100, 50:50, or 90:10 and with 40 mg of total Ca++. When NH4‐N nutrition was used, efficient strains exhibited Ca‐deficiency symptoms sooner or produced less dry matter than inefficient strains. The greatest reductions in dry weight production occurred between 50 and90%NH4‐N nutrition. The greatest reduction in solution pH and in%of Ca in plant tissues occurred between 0 and 50% NH4‐N nutrition. Ratings of Ca efficiency varied according to the proportion of NH4‐N in the nutrient solutions.

ISSN:0190-4167    

DOI:10.1080/01904168309363139

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904168309363131

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor