摘要:

Nine cuttings of ‘Alaskland’ red clover (Trifolium pratenseL.) grown in the greenhouse in a 24factorial experiment were made over a 2‐year period. Annual applications of two P and two K rates and sources in the presence and absence of additional C1 were made. The higher P rate did not increase clover yield, but did increase P percentage of and P uptake by the last five clippings only when K2SO4was used. Total C1 uptake was reduced by the higher P application. The higher K rate increased clover yield and P uptake. K source had no significant effect on clover yield. Uptake of C1 and C1 percentage were greater with KC1 than with K2SO4while total P uptake tended to be greater with K2SO4. Annual applications of 408 kg C1/ha depressed clover yield, P uptake and dry matter percentage, and increased C1 percentage and uptake. Available NO3‐N, P, and K in the soil were reduced by the nine clippings.

ISSN:0010-3624    

DOI:10.1080/00103627109366281

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Permanent powder mounts were prepared for X‐ray spectrographic analysis by molding bakelite powder at 24,000 psi and heating to 110C. Spraying with clear acrylic resin maintains surface permanency for non‐clayey samples. Standard curves for Si, Al, Fe, K, Ca, and Ti prepared with USGS and NBS rock powders were used to determine that two distinct textural layers of Mazama pumice had similar major element contents. Ground pumiceous lapilli from the weathered AC horizon (20–30 cm depth) had 4% less Ca, 4% less Si, 8% less K, 9% more Ti, 12% more Al, and 16% more Fe than unweathered pumice in the C1 and C2 horizons.

ISSN:0010-3624    

DOI:10.1080/00103627109366282

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The relative effectiveness of MnSO4(10 and 200 mesh) and MnO (8, 200 and 325 mesh) used in organic soil application was evaluated by plant growth, Mn concentration, Mn uptake and yield of Acme soybeans and Downing Yellow Globe onions.

ISSN:0010-3624    

DOI:10.1080/00103627109366283

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Contents of soil phosphorus and potassium vary appreciably in different localities of the Indonesian Archipelago. Data collected for riceland soils from seven irrigation areas (five on Java and one each on Sumatra and Sulawesi) show that average available phosphorus contents in the tilled layer may range from 23 ppm P at the Sumatra location to 203 ppm Pat the Sulawesi location. Average exchangeable potassium contents ranged from less than 0.2 meq/100g. K in the Sumatran soils to over 1.0 meq/100g. in potash‐rich soils of Java. Distinct regional differences in soil fertility of the magnitude observed indicate that blanket fertilizer recommendations cannot be made if rice production is to be increased without wasting chemical fertilizers which are relatively scarce and expensive in Indonesia. Increased emphasis must be placed on soil testing and soil fertility research in order to achieve the national goal of self‐sufficiency in food stuffs.

ISSN:0010-3624    

DOI:10.1080/00103627109366284

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Twelve leafy vegetables were grown on field plots treated with 0, 10, 50, 100, 200, 400, and 800 pounds Zn per acre incorporated into the 0‐ to 10‐inch soil depth. At harvest maturity the edible parts of the plants were sampled and analyzed for Zn.

ISSN:0010-3624    

DOI:10.1080/00103627109366285

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Growth parameters and Fe, Cu, Mn and N status ofEuglena graciliscells were determined as a function of level and source of Fe supply in the nutrient environment. Use of FeEDDHA promoted cell division while FeSO4·lb7H2O promoted cell enlargement after 7 days. Greatest N content was present in rapidly dividing as compared to enlarging cells. Copper content was directly related to cell size with larger cells containing more Cu than smaller cells. Manganese uptake was inversely related to Fe supply with FeSO4·lb7H2O inhibiting Mn uptake to a greater extent than chelated Fe. Iron uptake increased significantly with the addition of iorganic or chelated Fe. The Fe uptake was comparable from both sources at the 1 ppm Fe level of supply, but much greater amounts of Fe were accumulated from inorganic supply at the 10 ppm Fe level.

ISSN:0010-3624    

DOI:10.1080/00103627109366286

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Patches of discoloured ("scorched") plants developed on winter wheat growing in a field that had been fumigated with methyl bromide. Scorching was most marked round the methyl bromide injection sites and was associated with bromine uptake by the plants: the above‐ground parts of the scorched plants contained up to 0.61% bromine. In one scorched area, the first, second and third wheat crops after fumigation contained 0.42, 0.25 and 0.09% bromine respectively, so that three years was not sufficient to leach all the residual bromine from the soil.

ISSN:0010-3624    

DOI:10.1080/00103627109366287

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0010-3624    

DOI:10.1080/00103627109366280

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor