Yield response and availability of various phosphate fertilizer types as estimated by EUF

1985 ◽  
Vol 83 (1) ◽  
pp. 107-115 ◽  
Author(s):  
G. K. Judel ◽  
W. G. Gebauer ◽  
K. Mengel
Keyword(s):  
Phosphate Fertilizer ◽  
Yield Response

Response of newly planted peach and apple trees to superphosphate

1975 ◽  
Vol 26 (3) ◽  
pp. 521 ◽  
Author(s):  
BK Taylor
Keyword(s):  
Tree Growth ◽  
Phosphate Fertilizer ◽  
Fruit Trees ◽  
Yield Response ◽  
Apple Trees ◽  
Leaf Analysis ◽  
Major Interest ◽  
Marked Decline ◽  
One Year ◽  
Peach Trees

The response of peach and apple trees to added superphosphate was recorded both in the nursery and later in the orchard after transplanting. The peach and apple trees responded positively to phosphate applications in both the nursery and the orchard despite the initial presence of medium to high phosphate levels in the soils. Of major interest, too, was the absence of a consistent interaction between the phosphate treatments applied in the separate years. This suggested that the trees could not accumulate enough phosphorus in any one year to influence their response to further phosphate. Leaf analysis showed two important effects in relation to the phosphate treatments. Firstly, since high rates of application of fertilizer led to only small increases in the levels of phosphorus in the leaves, tree growth rate and phosphate absorption rate are apparently closely coupled. Secondly, the deliberate withholding of phosphate fertilizer from all trees in the fourth season led to a marked decline in the levels of phosphorus in the leaves of both peach and apple, which suggested that phosphate fertilizer should be applied annually to young fruit trees. With apple, but not peach, increasing the rate of phosphate applied in the third season stimulated the number of flower buds initiated, but this effect was not simply the result of increased vegetative growth. On the other hand, phosphate application to the peach trees in the orchard resulted in a positive fruit set and yield response in the absence of any tree growth response.

Corrigendum - Yield depression due to phosphate fertilizer in sugar-cane

1964 ◽  
Vol 15 (4) ◽  
pp. 537
Author(s):  
RA Yates
Keyword(s):  
Trace Element ◽  
Nitrogen Fertilization ◽  
Phosphate Fertilizer ◽  
Nitrogen Supply ◽  
Yield Response ◽  
Critical Levels ◽  
Ratio Effect ◽  
Calcium Magnesium ◽  
Low Nitrogen ◽  
Yield Depression

A large series of trials involving phosphate fertilizer showed that yields of cane could be reduced by the application of superphosphate at rates of up to 2 cwt/acre in four distinct areas. In these areas, the yield response to phosphate was dependent on the rate of nitrogen fertilization; yield depression only occurred where the nitrogen supply was adequate; phosphate could increase yields at low nitrogen. In most cases, the yield depression was associated with a low calcium/ magnesium (Ca/Mg) ratio in the soil (a ratio of less than 3.0 in terms of milliequivalents). On soils with high Ca/Mg ratios, regressions of yield response on soil or leaf phosphate indicated critical levels similar to those accepted elsewhere. Significant regressions could not be obtained from soils with low Ca/Mg ratios. A few trials testing a phosphate x trace element interaction indicated that the phosphate yield depression in at least one area was due to an induced deficiency of some trace element. The trace element effect is independent of the Ca/Mg ratio effect.

The effectiveness of several methods of applying superphosphate on yield response by wheat

1973 ◽  
Vol 13 (63) ◽  
pp. 430 ◽  
Author(s):  
CL Rudd ◽  
NJ Barrow
Keyword(s):  
Western Australia ◽  
South Australia ◽  
Phosphate Fertilizer ◽  
Yield Response ◽  
Yield Data ◽  
Economic Decisions

A useful method of analysing yield data from experiments comparing different methods and times of application of superphosphate is given. Responses by wheat at six sites in South Australia and two in Western Australia were analysed to compare the effectiveness of broadcast superphosphate (in December, March, or at seeding) with superphosphate drilled with the seed. Drilled phosphate was found to be about twice as effective as phosphate broadcast at seeding and three to four times as effective as phosphate broadcast in March or December. It is suggested that the 'effectiveness coefficients' could be used in making economic decisions on phosphate fertilizer practice.

YIELD RESPONSE OF CONQUEST BARLEY AS AFFECTED BY NITROGEN FERTILIZER AND SOIL TESTS FOR AMMONIUM- AND NITRATE-NITROGEN

1973 ◽  
Vol 53 (2) ◽  
pp. 163-168 ◽  
Author(s):  
W. F. NUTTALL
Keyword(s):  
Nitrogen Fertilizer ◽  
Nitrate Nitrogen ◽  
Climatic Factors ◽  
Phosphate Fertilizer ◽  
Nitrogen Fertilizers ◽  
Yield Response ◽  
Regression Analyses ◽  
Soil Tests ◽  
Quadratic Equations ◽  
Fertilizer Rates

Yield response of Conquest barley to nitrogen fertilizer applied at 22, 45, 67, and 134 kg/ha with and without 20 kg P/ha were significantly related by regression analyses to ammonium- and to nitrate-nitrogen in soils of northeastern Saskatchewan. Both linear and quadratic equations obtained from the regression analyses were used to develop tables estimating yield response of barley related to nitrogen fertilizer rates and soil tests for ammonium- and nitrate-nitrogen. The results indicated that a greater response to nitrogen fertilizer occurred with a given amount of ammonium- plus nitrate-nitrogen than with the same amount of nitrate-nitrogen alone. Phosphate fertilizer also significantly increased yield response to nitrogen fertilizers. Confidence intervals showed that wide variation could be expected in yield response to nitrogen fertilizers. Variation is attributed to differences in soil type, soil moisture, and climatic factors among experimental sites.

THE EFFECT OF PHOSPHATE FERTILIZER ON THE SALT TOLERANCE OF BARLEY GROWN ON SUMMERFALLOWED LAND

1983 ◽  
Vol 63 (2) ◽  
pp. 327-337 ◽  
Author(s):  
JOHN R. PETERS
Keyword(s):  
Salt Tolerance ◽  
Linear Regression ◽  
Full Range ◽  
Phosphate Fertilizer ◽  
Yield Function ◽  
Yield Response ◽  
Regression Equations ◽  
Unit Increase ◽  
P Fertilizer ◽  
Salinity Levels

The effect of fertilizer P on the salt tolerance of barley grown on previously summerfallowed land was studied under dryland field conditions. Linear regression equations showed that the yield response to added fertilizer P did not change significantly over the full range of salinity levels experienced. Linear regression equations using mean soil salinity levels to a 60-cm depth equal to or greater than 6 mS∙cm−1 appeared to describe the yield function of barley more realistically than did equations using the entire range of salinity levels. Both fertilized and unfertilized barley yields were not affected by salinity until a level of 4 mS∙cm−1 had been reached. Beyond this point yields were reduced by approximately 9–10% per unit increase in salinity. It was concluded that added fertilizer P did not improve the salt tolerance of barley grown under dryland conditions in Saskatchewan. Key words: Salinity, barley, P fertilizer, salt tolerance, yield

scholarly journals Respon Hasil Jagung Manis Terhadap Takaran Pupuk Fosfat pada Andisol Lembang

2018 ◽  
Vol 1 (2) ◽  
pp. 13
Author(s):  
Endang Sufiadi
Keyword(s):  
Sweet Corn ◽  
Block Design ◽  
Maximum Yield ◽  
Phosphate Fertilizer ◽  
Yield Response ◽  
Corn Yield ◽  
West Java ◽  
Potential Yield ◽  
Randomized Block Design ◽  
Fertilizer Rates

An experiment was conducted at experimental field of BBHAT, Cikole Lembang, West Java District, West Java, on elevation of 1.250 m above sea level, from July to October 2008. The objective of this experiment was to study the Yield Response of Sweet Corn on the Phosphate Fertilizer Rates in Lembang Andisol. The design used was a Randomized Block Design with five treatments and five replication of A = without phosphate fertilizer, B=75 kg ha-1 P2O5, C= 150 kg ha-1 P2O5, D=225 kgha-1 P=O5, E=300 kg ha-1 P2O5. The result of experiment showed that yield response of sweet corn on the phosphate rate in Lembang Andisol is quadratic form. Maximum yield of corn cob with husk per plant of 575,24 grams per plant was obtained at the optimum phosphate rate of 190,7 kg ha-1 P2O5. This corn yield is equivalent to 22 tons ha-1 higher than the potential yield of these sweet corn variety. Soil-available P increased with increasing rates of phosphate fertilizer, reaches a very high criteria.

Factors affecting yield and fertilizer response of sugar beet in Iran

1973 ◽  
Vol 81 (2) ◽  
pp. 311-316
Author(s):  
E. W. Bolle-Jones ◽  
F. Sanei
Keyword(s):  
Sugar Beet ◽  
Field Experiments ◽  
Phosphate Fertilizer ◽  
Fertilizer Application ◽  
Yield Response ◽  
Soil Test ◽  
Nitrogen And Phosphorus ◽  
Fertilizer Response ◽  
High Calcium ◽  
Yield Responses

SummaryField experiments were conducted in four provinces of Iran in which sugar-beet yield responses to added nitrogen and phosphorus fertilizers were correlated with soil test values and number of irrigations.Although significant yield responses to fertilizer application were obtained in all four provinces, extremely few significant relationships were established between soil test values and yield response.Average crop yield was favourably influenced by the number of irrigations applied in Fare and Khorasan, by organic carbon status in Esfahan and Khorasan and adversely affected by increased soil conductivity in Esfahan and Khorasan. These results were taken to imply an inadequate number of irrigations in Fars and Khorasan. The high calcium carbonate status found in Fars soil adversely affected the level of average yield.Response to nitrogen fertilizer declined in Fars and Khorasan as the leaf nitrogen exceeded 3·15 and 4·0% respectively. Response to phosphate fertilizer declined in West Azerbaijan and Khorasan when leaf phosphorus exceeded 0·4%.

Yield depression due to phosphate fertilizer in sugar-cane

1964 ◽  
Vol 15 (4) ◽  
pp. 537
Author(s):  
RA Yates
Keyword(s):  
Trace Element ◽  
Nitrogen Fertilization ◽  
Phosphate Fertilizer ◽  
Nitrogen Supply ◽  
Yield Response ◽  
Critical Levels ◽  
Ratio Effect ◽  
Calcium Magnesium ◽  
Low Nitrogen ◽  
Yield Depression

A large series of trials involving phosphate fertilizer showed that yields of cane could be reduced by the application of superphosphate at rates of up to 2 cwt/acre in four distinct areas. In these areas, the yield response to phosphate was dependent on the rate of nitrogen fertilization; yield depression only occurred where the nitrogen supply was adequate; phosphate could increase yields at low nitrogen. In most cases, the yield depression was associated with a low calcium/ magnesium (Ca/Mg) ratio in the soil (a ratio of less than 3.0 in terms of milliequivalents). On soils with high Ca/Mg ratios, regressions of yield response on soil or leaf phosphate indicated critical levels similar to those accepted elsewhere. Significant regressions could not be obtained from soils with low Ca/Mg ratios. A few trials testing a phosphate x trace element interaction indicated that the phosphate yield depression in at least one area was due to an induced deficiency of some trace element. The trace element effect is independent of the Ca/Mg ratio effect.

The relationship between soil phosphorus and response by sugar beet to phosphate fertilizer on mineral soils

1971 ◽  
Vol 77 (1) ◽  
pp. 117-121 ◽  
Author(s):  
A. P. Draycott ◽  
M. J. Durrant ◽  
D. A. Boyd
Keyword(s):  
Acetic Acid ◽  
Sugar Beet ◽  
Sodium Bicarbonate ◽  
Ammonium Acetate ◽  
Phosphate Fertilizer ◽  
Yield Response ◽  
Free Calcium ◽  
Anion Resin ◽  
P Fertilizer ◽  
Group 1

SummaryResults of two groups of experiments testing phosphate fertilizer for sugar beet were re-examined; there were 53 experiments made between 1957 and 1960 in group 1 and 25 experiments between 1957 and 1959 in group 2. The mean response of total sugar to 126 kg/ha P2O5 was only 160 kg/ha but on a few fields response exceeded 1000 kg/ha. Response seemed to be greater in 1958 than in the other years, but between-site variance accounted for most of the difference from year to year.Stored soil samples were analysed for phosphorus by four methods; the results were compared and related to the yield response to phosphate fertilizer. After allowing for experimental error, the percentages of the between-sites variance of the responses accounted for by log (soil P) were (group 1 first): sodium bicarbonate, 60 and 62%; anion resin, 52 and 30%; ammonium acetate/acetic acid, 52 and 0%; and calcium chloride, 42 and 2%. When soil pH was included in the regression equation, prediction of response by anion resin much improved and equalled that of sodium bicarbonate. Ammonium acetate/acetic acid was ineffective on soils with much free calcium carbonate.As two-thirds of the soils had sodium bicarbonate-soluble phosphorus concentrations between 15 and 45 ppm P with mean response 65 kg/ha sugar, there is only limited scope for increasing the profitability of the crop by improving P manuring. However, more P fertilizer can be recommended for the few soils with ≤ 10 ppm P and P fertilizer can be withheld from fields with more than 45 ppm. The dressings we recommend are 180, 120, 60, 30 and 0 kg/ha P2O5 (approximately 1·5, 1·0, 0·5, 0·25 and 0 cwt/acr P2O5) on soils with ≤ 10, 11·15, 16·25, 26·45 and ≥45 ppm sodium bicarbonatesoluble P respectively.

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