摘要:

Studies were conducted to evaluate the use of a solid‐state chloride electrode for chloride determinations in soil extracts. The solid‐state chloride ‐electrode was used as an end point detector in the titration of chloride with AgN03and direct reading of chloride in solution. The solid‐state electrode gave results very similar to those obtained with a silver electrode (r = 0.999) when used as an end point detector. Values obtained using the solid‐state electrode as a direct reading electrode were also well correlated (r = 0.998) but were slightly higher than results obtained by titration with a silver electrode.

ISSN:0010-3624    

DOI:10.1080/00103627109366310

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Using yields of plants obtained at various times of the year and from probable assumptions relative to sugar production, solute sorption, and solute distributions between roots and tops it has been deduced that both deficiencies and toxicities in mineral nutrition would be expected to be revealed earlier or more prominently in a summer season. Light is the primary determining environmental factor. The locus of nutrient deficiency revelation depends on the remobility of the element in the plant; toxic disorder is usually revealed in the oldest foliar parts.

ISSN:0010-3624    

DOI:10.1080/00103627109366311

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The analysis of plant tissue, generally leaves, is considered to be an important step in diagnosing and confirming a mineral element deficiency. The mineral element status of the plant can be accurately measured by the analysis of plant tissue if the tissue is properly sampled. Tissue analysis is often the best indication for recommending fertilizer or supporting nutrient spray treatments.

ISSN:0010-3624    

DOI:10.1080/00103627109366312

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Results of a field experiment, comprising elemental S and three commercial preparations of Fe, applied with and without several other factors showed that the application of S was significantly better than that of Fe supplying materials in preventing the incipient chlorosis of corn leaves on the alkaline calcareous soils. Prevention of chlorosis in corn due to sulphur application increased the grain yield of corn 25–31%.

ISSN:0010-3624    

DOI:10.1080/00103627109366313

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Irrigated potatoes were grown on a sandy soil which ranged in available P and K from 53 to 308 and 45 to 319 kg/ha, respectively. The levels of soil P and K as measured by soil test (Bray #1) were compared with yield, specific gravity of the tubers, and P and K tissue concentrations. The response of the potato crop was correlated to soil K but not to soil P. Yields increased with increasing soil K from 45 to 196 kg/ha in the surface sample and leveled off there after. The fact that the levels of subsoil K increased with increasing surface soil K may have had somewhat of an effect on the leveling off of potato yields at 196 kg/ha of K. The lack of a yield response to soil P was associated with adequate available soil P at the lowest soil test levels.

ISSN:0010-3624    

DOI:10.1080/00103627109366314

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Humic substances from an Argentinian chesnut (Mollisol) soil were extracted with Na‐Dowex A‐1 resin, 0.1 N NaOH and 0.1 M Na4P2O7without decalcification and with 0.1 N NaOH after decalcification. Humic to fulvic (Ch/Cf) acid and E4/E6ratios of the extracts were determined and compared.

ISSN:0010-3624    

DOI:10.1080/00103627109366315

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Regardless of inoculum or fertility rate Bragg outyielded Clark 63 soybeans. Yields of Bragg and Clark 63 were increased about 1000 kg per ha by treatment with inoculum at the rate of approximately 313, 000 bacteria per seed. At the highest rate of applied N, yields of uninoculated soybeans, were lower than the inoculated soybeans at the lowest applied N rate. Phosphorus fertilizer increased yields at a decreasing rate and yields were decreased at the highest rate of applied P. Potassium fertilizer had a negative effect on soybean yields and did not significantly effect the protein or oil content of soybean seed. With increasing P fertilizer rates, there was a decrease in oil content and in increase in protein content of soybean seed.

ISSN:0010-3624    

DOI:10.1080/00103627109366316

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

An economic interpretation was applied to a soybean yield prediction equation derived from data obtained in an experiment at Jabalpur, M.F. It was shown that no level of applied P could substitute for variety selection in terms of either soybean yield or economic returns per ha. Illustrative examples of the minimum price that must be obtained for soybeans before it is profitable to use P fertilizer for given price situations were shown.

ISSN:0010-3624    

DOI:10.1080/00103627109366317

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

An experiment to determine the effect of inoculum, N, P, and K on certain attributes of two soybean varieties was conducted in 1967 at JNKW. The experimental area had no prior history of soybean production and contained few, if any, soybean rhizobia.

ISSN:0010-3624    

DOI:10.1080/00103627109366318

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0010-3624    

DOI:10.1080/00103627109366309

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor