Agronomic Effectiveness of Cationic Phosphate Impurities Present in Superphosphate Fertilizers as Affected by Soil pH

2006 ◽  
Vol 37 (13-14) ◽  
pp. 2057-2067 ◽  
Author(s):  
L. I. Prochnow ◽  
S. H. Chien ◽  
G. Carmona ◽  
E. R. Austin ◽  
J. E. Corrente ◽  
...  
Keyword(s):  
Soil Ph ◽  
Agronomic Effectiveness

Low effectiveness of three rock phosphates as phosphorus fertilizers and liming materials on an acid clay-loam

1987 ◽  
Vol 38 (6) ◽  
pp. 1033 ◽  
Author(s):  
JS Yeates ◽  
DG Allen
Keyword(s):  
Soil Ph ◽  
Dry Matter ◽  
Phosphorus Uptake ◽  
Subterranean Clover ◽  
P Uptake ◽  
Clay Loam ◽  
Agronomic Effectiveness ◽  
Rock Phosphates ◽  
Extractable P ◽  
Soil Buffering

The effectiveness of three finely ground rock phosphates (PRs) was compared with ordinary superphosphate (OSP) for subterranean clover growth and for increasing soil bicarbonate-extractable P levels over two successive 8-week periods on a very acid clay-loam (pH (0.01 M CaCl2) 4.3) in a glasshouse experiment. All PR sources were poorly effective compared to OSP. Maximum dry matter and P uptake of each PR source was less than that of OSP at each harvest. Relative to surface application, mixing throughout the soil reduced the effectiveness of OSP for dry matter and P uptake, but had little effect on the PR sources. Relative to OSP, the effectiveness of PR sources did not increase at the second harvest. Bicarbonate-extractable P levels for soil-incorporated Island PR plateaued below the highest rate applied. Phosphorus uptake by the herbage at harvests 1 and 2 was not well related to soil bicarbonateextractable P levels at harvest 1, and source dependency was indicated. Soil pH was markedly increased by each of PR sources at application rates within the rates required to reach maximum dry matter and P yield. Increased soil pH at high PR applications is likely to have reduced PR dissolution, and contributed to low agronomic effectiveness. Dry matter yield at both harvests was dependent on P concentration in the tops, regardless of the P source or method of P application. A higher soil buffering capacity for pH, P or Ca than was present in this soil seems necessary for sufficient PR dissolution to achieve the same agronomic effectiveness as OSP.

Dissolution rate and agronomic effectiveness of struvite fertilizers – effect of soil pH, granulation and base excess

2016 ◽  
Vol 410 (1-2) ◽  
pp. 139-152 ◽  
Author(s):  
Fien Degryse ◽  
Roslyn Baird ◽  
Rodrigo C. da Silva ◽  
Mike J. McLaughlin
Keyword(s):  
Dissolution Rate ◽  
Soil Ph ◽  
Base Excess ◽  
Agronomic Effectiveness

Comparing the agronomic performance of soluble and slow release phosphate fertilisers: the experimental basis for RPR recommendations

1991 ◽  
pp. 181-190
Author(s):  
D.C. Edmeades ◽  
J.H. Watkinson ◽  
K.W. Perrott ◽  
A.G. Sinclair ◽  
S.F. Ledcard ◽  
...  
Keyword(s):  
Soil Ph ◽  
Slow Release ◽  
Lag Time ◽  
Production Data ◽  
Agronomic Performance ◽  
Experimental Basis ◽  
Triple Superphosphate ◽  
Agronomic Effectiveness ◽  
Single Superphosphate ◽  
Pasture Production

Recent results from field trials comparing the agronomic effectiveness of water soluble fertilisers (single superphosphate (SSP), triple superphosphate (TSP)) and fertilisers of low water solubility ('slow release', reactivephosphaterock (RPR) fertilisers) are reviewed. It is shown that the pasture production data from the 'National Series' of trials are consistent with, and can be described by, a model for the dissolution of RPR in soil. Applying both the pasture production data and the dissolution model the term 'lag time' associated with 'slow release' RPR is defined and quantified for New Zealand conditions. Results show that on average the rate of release of P from RPR is about 30% within the year of application, 23% in year 2 and progressively less in subsequent years. It follows that when RPR is applied annually, the amount of Preleased annually, from the current application and from the residues of previous annual applications, is 30,53,70,82, 9 1,96% as a fraction of the total P applied annually. Consequently about 3.5 times the amount of RPRP is required to achieve the same yield as soluble P in year 1, about 2 times in year 2 and 1.5 in year 3. The lag time is defined as the time required to accumulate sufficient RPR residues in the soil from applications such that the annual amount of P dissolved from RPR each year is equal to or greater than 90% of the amount of total RPR-P applied annually. The lag time associated with RPR use is about 4-6 years depending on the site. The agronomic performance of RPR based on the National Series data was not associated with soil pH (5.1 to 6.3), annual rainfall (700 to 1800 mm) or soil phosphate retention (13-98%). This probably reflects the narrow range and confounding effects of the soil and climate factors. The experimental basis for the current soil pH and rainfall boundary conditions are briefly discussed. Available evidence suggests that the P dissolved from RPR has the same agronomic effectiveness as P from soluble fertiliscrs. The agronomic implications of these results on P fertilisers of intermediate solubility (i.e. PAPR and Longlife) are discussed in relation to field results. Keywords agronomy, comparison, dissolution, fertilisers, Longlife, PAPR,phosphorus, RPR, slow release, soluble P, single superphosphate, triple superphosphate

scholarly journals Response of Peanut due to Application of Dolomite Plus

2012 ◽  
Vol 17 (2) ◽  
pp. 143
Author(s):  
Mas Teddy Sutriadi ◽  
Diah Setyorini
Keyword(s):  
Soil Ph ◽  
Maximum Rate ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Soil Productivity ◽  
Agronomic Effectiveness ◽  
Peanut Crop ◽  
Relative Agronomic Effectiveness ◽  
Npk Fertilizer ◽  
Bray 1

Most developing areal for peanut crop (Arachis hoypogeae) is upland, that is dominated by parent soil and has acidcharacteristis. Main constraints for this soil are pH and low soil productivity. Dolomite plus is a dolomite ameliorant,with phosphate nutrient. The dolomite plus beside as the ameliorant and a source of magnecium and calciumnutrients, also as a source of phosphate nutrient. The objective of the research was to study effectivity of dolomiteplus on peanut growth in Inceptisols soil. This research was conducted in the greenhouse using a randomizecompletely designed with 8 treatments and 5 replications. The treatments were control, NPK, and combinations ofNPK with six dolomite plus levels. Relative Agronomic Effectiveness (RAE) analyses was used determine to theeffectivity of dolomite plus. The result showed that application of dolomite plus 1,600 kg ha-1 with NPK fertilizerincreased dry weight of grain yield untill 27% (11.53 to 14.65 g plant-1) compared to NPK fertilizer application alone,that was showed by RAE > 100% or among 171-251%. Application of dolomite plus with NPK increased soil pH, soilavailable P (Bray 1), Ca and Mg exchangeable, and CEC as 1.9 unit; 6.2 mg kg-1; 15.87 cmol(+) kg-1; 14.27 cmol(+)kg-1; and 17.29 cmol(+) kg-1 respectively. Maximum rate of dolomite plus was 2,500 kg ha-1 with the yield was 14.2 gplant-1 grain dry weight. The rate of dolomite plus that was higher than 2,500 kg ha-1 could decrease the yield[How to Cite: Sutriadi MT and D Setyorini. 2012. Response of Peanut due to Application of Dolomite Plus. J Trop Soils 17: 143-150. Doi: 10.5400/jts.2012.17.2.143] [Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.2.143]

LIME AND DAIRY PRODUCTION

1982 ◽  
pp. 93-103
Author(s):  
N.A. Thomson
Keyword(s):  
Soil Moisture ◽  
Dairy Cows ◽  
Milk Production ◽  
Soil Ph ◽  
Dairy Production ◽  
Pasture Production ◽  
The Third ◽  
One Year ◽  
Plasma Magnesium

In a four year grazing trial with dairy cows the application of 5000 kg lime/ ha (applied in two applications of 2500 kg/ha in winter of the first two years) significantly increased annual pasture production in two of the four years and dairy production in one year. In three of the four years lime significantly increased pasture growth over summer/autumn with concurrent increases in milk production. In the last year of the trial lime had little effect on pasture growth but a relatively large increase in milkfat production resulted. A higher incidence of grass staggers was recorded on the limed farmlets in spring for each of the four years. In the second spring immediately following the second application of lime significant depressions in both pasture and plasma magnesium levels were recorded. By the third spring differences in plasma magnesium levels were negligible but small depressions in herbage magnesium resulting from lime continued to the end of the trial. Lime significantly raised soil pH, Ca and Mg levels but had no effect on either soil K or P. As pH levels of the unlimed paddocks were low (5.2-5.4) in each autumn and soil moisture levels were increased by liming, these factors may suggest possible causes for the seasonality of the pasture response to lime

Agroforestry in Eastern Otago: results from two long-term experiments

2000 ◽  
pp. 93-98
Author(s):  
G.G. Cossens ◽  
M.F. Hawke
Keyword(s):  
Soil Ph ◽  
Tree Growth ◽  
Pinus Radiata ◽  
Carrying Capacity ◽  
Livestock Grazing ◽  
Tree Age ◽  
Rapid Decline ◽  
Pasture Production ◽  
Clover Content ◽  
Pasture Yield

During the first 20 years of a Pinus radiata tree rotation, tree growth and pasture yield were assessed under a range of tree spacings at Invermay and Akatore, two coastal sites in Eastern Otago. Pasture yield in association with trees thinned to 100 stems per hectare (sph) was comparable to that from open pasture up to a tree age of 12 years. By the 19th year, however, pasture production declined to 63% of open pasture yield at Invermay and to 42% at Akatore. At 200 and 400 sph at Akatore, pasture yield was similar to that from open pasture at tree age 12 years but declined to 27% and 0% of open pasture yield respectively by year 20. At both Invermay and Akatore, the ryegrass and clover content of open pasture was relatively constant throughout the term of the trial. However, both the ryegrass and clover content of pasture beneath trees began to decline by tree age 12 years with a very rapid decline at Akatore in the number of pasture species at 200 sph by the 19th year. No pasture remained at 400 sph, after 19 years. Livestock carrying capacity with sheep on tree treatments at Invermay decreased from 100% of open pasture at year 6 to 60% by year 10. At Akatore, livestock carrying capacity averaged over the 20-year life of the trial was 4.1 stock units per hectare with a maximum of 8.1 stock units at a tree age of 8 years. Tree growth at both sites was similar, averaging between 1 and 1.1 m/year in height over 20 years, with trees at Invermay at 100 sph averaging 9% greater height and diameter growth than at Akatore. Increasing tree stocking from 100 to 200 to 400 sph at Akatore, resulted in increased tree height, but decreased diameter at breast height. A comparison of the East Otago trees with those in a similar trial at Tikitere (Rotorua) 900 km further north indicated that the southern trees were about 6 years later in their growth pattern by tree age 20 years. On both sites, soil pH tended to be lower in the presence of trees and was significantly lower than in open pasture by year 20. The results and comparisons with the Tikitere data suggest that, in an integrated agroforestry regime, there will be livestock grazing under the trees further into the tree rotation in Otago than in North Island sites. However, slower tree growth would result in a longer rotation time to harvest. Current recommendations to farmers are to plant trees on the less productive areas of the farm and adopt a tree stocking rate which fully utilises the site. Keywords: agroforestry, livestock, pasture, Pinus radiata, soil pH, tree stocking

Growth and Mineral Nutrition in Salt Stressed Guava ( Psidium guajava L.) cv . Allahabad Safeda

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
ANSHUMAN SINGH ◽  
ASHWANI KUMAR ◽  
R.K. YADAV ◽  
ASHIM DUTTA ◽  
D.K. SHARMA
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Plant Height ◽  
Salinity Tolerance ◽  
Soil Ph ◽  
High Salinity ◽  
Psidium Guajava ◽  
Sodium Adsorption Ratio ◽  
Saline Soils ◽  
Experimental Soil

Guav a cv . Allahabad Safeda w as grown in saline soils and irrigated with the best av ailable w ater -1 -1 + -1 (EC 2.8 dS m ). Based on chemical composition (pH- 7.1, EC - 2.8 dS m , Na - 20.04 meq l and IW IW sodium adsorption ratio- 4.86), irrigation w ater w as categorized as marginally saline. The soil pH 2 -1 w as mostly below 8.5 but mean electrical conductivity (EC ) v alues ranged from 0.5-2 dS m 2 indicating moderate to high salinity in the experimental soil. After one-y ear of experimentation, fiv e plants randomly selected from each treatment and the data w ere recorded. Plant height -1 -1 significantly increased (LSD 5%) with increase in salinity from 0.5 dS m to 1.4 dS m . A similar -1 trend w as noted with respect to stem girth. The av erage plant height at 0.5, 0.9 and 1.4 dS m salinity lev els w as 98.3 cm, 108.3 cm and 123 cm, respectiv ely whereas the corresponding stem girth v alues -1 w ere 2.24 cm, 2.28 cm and 2.46 cm. At 2 dS m salinity ,how ev er , both av erage plant height (94.6 cm) and stem girth (2.24 cm) significantly decreased and w ere found to be comparable to control (0.5 dS -1 + -1 m ) v alues. Plants show ed negligible Na accumulation in leav es up to 1.4 dS m salinity , but -1 + exposure to elev ated salinity (2 dS m ) significantly increased leaf Na (0.16% DW). These data -1 indicated a salinity tolerance (EC )threshold of about 1.5 dS m inguav a cultiv ar Allahabad Safeda.

PROPERTIES IMPROVEMENT AND HYDROPHOBICITY PREVENTION OF PEAT SOIL IN OIL PALM PLANTATION THROUGH STEEL SLAG APPLICATION

2016 ◽  
Vol 24 (1) ◽  
pp. 39-46
Author(s):  
Winarna Winarna ◽  
Iput Pradiko ◽  
Muhdan Syarovy ◽  
Fandi Hidayat
Keyword(s):  
Soil Ph ◽  
Oil Palm ◽  
Water Retention ◽  
Peat Soil ◽  
Steel Slag ◽  
Field Capacity ◽  
Ash Content ◽  
Oil Palm Plantation ◽  
Randomized Design ◽  
Four Levels

Development of oil palm plantation on peatland was faced with hydrophobicity problem caused by over drained. Hydrophobicity could reduce water retention and nutrient availability in the peat soil. Beside of proper water management application, addition of soil ameliorant which contain iron could increase stability and improve peat soil fertility. The study was conducted to obtain the effect of steel slag on peat soil properties and hydrophobicity. In this study, peat soil was incorporated with steel slag and incubated in 60 days period. The research was employed completely randomized design (CRD) factorial 2 x 2 x 4. First factor is peat maturity consists of two levels: sapric (S) and hemic (H), while the second factor is soil moisture which also consist of two levels: field capacity (W1) and dry (under the critical water content) (W2). The third factor is steel slag dosage which consist of four levels: 0 g pot (TB0), 7.17 g pot (TB1), 14.81 g -1 -1 pot (TB2), and 22.44 g pot (TB3). The result showed that application of steel slag significantly increase of soil pH, ash content, and water retention at pF 4.2. Furthermore, application of steel slag significantly reduce time for water reabsorption (wettability) in sapric. On the other hand, there are negative corellation between water penetration and soil pH, ash content, and water retention at pF 4.2. Overall, application of steel slag could increase wettability and prevent peat soil hydrophobicity.

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