EFFECT OF COMBINING ORGANIC RESIDUES WITH MINJINGU PHOSPHATE ROCK ON SORPTION AND AVAILABILITY OF PHOSPHORUS AND MAIZE PRODUCTION IN ACID SOILS OF WESTERN KENYA

2007 ◽  
Vol 43 (1) ◽  
pp. 51-66 ◽  
Author(s):  
M. N. KIFUKO ◽  
C. O. OTHIENO ◽  
J. R. OKALEBO ◽  
L. N. KIMENYE ◽  
K. W. NDUNG'U ◽  
...  
Keyword(s):  
Soil Ph ◽  
Phosphate Rock ◽  
Farmyard Manure ◽  
Combined Treatment ◽  
Chicken Manure ◽  
Available P ◽  
Organic Residues ◽  
Maize Production ◽  
Study Results ◽  
Minjingu Phosphate Rock

Experiments were conducted in both the greenhouse and the field on highly weathered (Orthic Ferralsol) soils to evaluate the effect of combining on-farm organic residues (chicken manure, farmyard manure, sugar bagasse) with Minjingu phosphate rock (MPR) on soil pH, extractable (available) and sorbed phosphorus (P), and to assess the cost benefit for maize production. The greenhouse study results indicated that, in the first eight weeks of incubation, soil pH increased linearly with increase in MPR rates and decreased thereafter. The available P also increased linearly. Chicken manure and sugar bagasse were most and least effective respectively in reducing P sorption, while there was a significant negative relationship between P adsorption maxima and extractable P. The field experiment data showed that the available P values increased significantly above the control in all the treatments where MPR and organic materials were applied separately or combined. Treatment effects on Langmuir sorption maxima (Smax) in the field were variable. An increase in Smax with an increase in MPR rates was noted. However, there was a positive relationship between Smax and available P (r = 0.52 to 0.69), suggesting the diversity of factors affecting the complex nature of P dynamics under field conditions. MPR applied alone in the first season gave a significant residual positive effect on maize grain yield for two additional seasons. The economic analysis revealed that a single application of chicken manure (2 t ha−1) combined with MPR at 60 kg P ha−1 gave the highest incremental net benefit equivalent to US$ 657 ha−1 during the three maize cropping seasons.

Response of Sorghum (Sorghum bicolor (L.) Munch) and Chemical Characteristics of Soil to Organic and Inorganic Fertilizers on Kenyan Lower Midlands Acid Soil

2019 ◽  
pp. 1-8
Author(s):  
P. O. Kisinyo ◽  
P. A. Opala ◽  
S. O. Gudu
Keyword(s):  
Grain Yield ◽  
Soil Ph ◽  
Farmyard Manure ◽  
Available P ◽  
Triple Superphosphate ◽  
Nutrient Inputs ◽  
Inorganic Fertilizers ◽  
Calcium Ammonium Nitrate ◽  
Total N ◽  
Sorghum Grain

Soil acidity, low level of nitrogen (N), phosphorus (P) and soil organic matter are major constraints to sorghum production in Kenya. We investigated the effect of farmyard manure (FYM) and combined application of inorganic nitrogen and phosphate fertilizers applied as calcium ammonium nitrate and triple superphosphate respectively, on soil pH, available P, total N, organic carbon and sorghum grain yield, on a smallholder farm in Siaya County, Kenya. The experiment was a randomized complete block design consisting of four treatments i.e., FYM applied at 0 and 4 t ha-1 in a factorial arrangement with inorganic fertilizers applied to provide 0 and 26 kg P ha-1 + 75 kg N ha-1, replicated three times. The study was conducted during the long rains of March to June and short rains September to December, 2017. Farmyard manure was applied only during the long rains season of 2017, while P and N fertilizers were applied in both cropping seasons. Soil sampling was done before treatment applications and at harvest time. Soil analysis revealed that the soil was acidic (pH = 4.9) with low available P (5.3 mg kg-1 and N (0.08%) but moderate amounts of C (2.0%) and Ca (3.4 cmol kg-1). The effect of sole application of FYM on soil P, N and grain yield were lower than those of the inorganic fertilizers. Farmyard manure increased soil pH because of its alkalinity (pH = 7.1) while triple superphosphate reduced it due to release of phosphoric acid into the soil. The mean annual (average of two seasons) grain yield increments, above the control with no nutrient inputs, due to 4.0 t FYM, 26 kg P ha-1 + 75 kg N ha-1 and 4.0 FYM + 26 kg P ha-1 + 75 kg N ha-1 were 64, 191 and 259%, respectively. Therefore combined applications of FYM and N and P fertilizers have the potential to increase sorghum grain yield on Kenyan acid soils.

IMMEDIATE AND RESIDUAL EFFECTS OF LIME AND PHOSPHORUS FERTILIZER ON SOIL ACIDITY AND MAIZE PRODUCTION IN WESTERN KENYA

2013 ◽  
Vol 50 (1) ◽  
pp. 128-143 ◽  
Author(s):  
P. O. KISINYO ◽  
C. O. OTHIENO ◽  
S. O. GUDU ◽  
J. R. OKALEBO ◽  
P. A. OPALA ◽  
...  
Keyword(s):  
Soil Ph ◽  
Residual Effects ◽  
Available P ◽  
Fertilizer Rate ◽  
Maize Production ◽  
Western Kenya ◽  
Exchangeable Al ◽  
Soil Available P ◽  
P Fertilizer ◽  
Fertilizer Recovery

SUMMARYSoil acidity and phosphorus (P) deficiency are some of the major causes of low maize yields in Kenya. This study determined the immediate and residual effects of lime and P fertilizer on soil pH, exchangeable aluminium (Al), available P, maize grain yield, agronomic P use and P fertilizer recovery efficiencies on a western Kenya acid soil. The treatments were: P fertilizer (0, 26 and 52 kg P ha−1as triple super phosphate) and lime (0, 2, 4 and 6 tons lime ha−1) applied once at the beginning of the study. A burnt liming material with 92.5% calcium carbonate equivalent was used. Soil samples were analysed prior to and after treatment application. The site had low soil pH–H2O (4.9), available P (2.3 mg kg−1), total N (0.17%), high Al (2.0 cmol kg−1exchangeable Al and 29% Al saturation). Lime reduced soil pH and exchangeable Al, leading to increased soil available P. Lime at 2, 4 and 6 tons ha−1maintained soil pH ≥ 5.5 for 2, 3 and 4 years, respectively. The study observed that the recommended P fertilizer rate (26 kg P ha−1) for maize production in Kenya was inadequate to raise soil available P to the critical level (≥10 mg P kg−1soil bicarbonate extractable P) required for healthy maize growth. To maintain soil available P at the critical level where 52 kg P ha−1and combined 52 kg P ha−1+ 4 tons lime ha−1were applied, it would be necessary to reapply the same P fertilizer rate after every one and two cropping seasons, respectively. The 4-year mean grain yield increments were 0.17, 0.34, 0.50, 0.58 and 1.17 tons ha−1due to 2, 4, 6 tons lime ha−1, 26 kg P and 52 kg P ha−1, respectively. Both agronomic P use and P fertilizer recovery efficiencies increased with increasing rates of lime and decreased with increasing rates of P fertilizer. Therefore, combined applications of both lime and P fertilizer are important for enhancing maize production on P-deficient acid soils in western Kenya.

scholarly journals Effects of Organic and Inorganic Materials on Soil Acidity and Phosphorus Availability in a Soil Incubation Study

ISRN Agronomy ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
P. A. Opala ◽  
J. R. Okalebo ◽  
C. O. Othieno
Keyword(s):  
Soil Ph ◽  
Phosphate Rock ◽  
Farmyard Manure ◽  
Inorganic Materials ◽  
P Availability ◽  
Soil Fertility Management ◽  
Inorganic P ◽  
Exchangeable Acidity ◽  
Incubation Study ◽  
P Sources

We tested the effects of two organic materials (OMs) of varying chemical characteristics that is, farmyard manure (FYM) and Tithonia diversifolia (tithonia), when applied alone or in combination with three inorganic P sources, that is, triple superphosphate (TSP), Minjingu phosphate rock (MPR), and Busumbu phosphate rock (BPR) on soil pH, exchangeable acidity, exchangeable Al, and P availability in an incubation study. FYM and tithonia increased the soil pH and reduced the exchangeable acidity and Al in the short term, but the inorganic P sources did not significantly affect these parameters. The effectiveness of the inorganic P sources in increasing P availability followed the order, TSP > MPR > BPR, while among the OMs, FYM was more effective than tithonia. There was no evidence of synergism in terms of increased available P when organic and inorganic P sources were combined. The combination of OMs with inorganic P fertilizers may, however, have other benefits associated with integrated soil fertility management.

scholarly journals Changes in Soil Available Phosphorus, Leaf Phosphorus Content and Yield of Sword Bean (Canavalia ensiformis (L.) DC.) by Application of SP-36 and Phosphate Rock on Acid Upland Soil of East Lampung

2016 ◽  
Vol 20 (1) ◽  
pp. 29
Author(s):  
Achmad Arivin Rivaie
Keyword(s):  
Soil Ph ◽  
Phosphate Rock ◽  
Phosphorus Content ◽  
Available P ◽  
Available Phosphorus ◽  
Upland Soil ◽  
Canavalia Ensiformis ◽  
Soil Available Phosphorus ◽  
P Fertilizer ◽  
Total P

A glasshouse trial was performed to determine changes in phosphorus (P) nutrition and the yield of sword bean (Canavalia ensiformis (L.) DC.) following the application of different rates and types of P fertilizer in an acid upland soil of East Lampung. Two different types of P fertilizer, namely SP-36 (total P = 36%) and Phosphate Rock (PR) (total P = 24.3%, particle size distribution = 75% <0.25 mm, 85% < 0.50 mm, 90% < 1.00 mm) were used in the trial. For the treatment, each P fertilizer type consisted of four rates (0, 50, 100 and 150 mg P2O5 kg-1 soil) that were arranged in a Completely Randomized Design with four replications. The results showed that the application of P fertilizers had significant effects on soil pH, soil plant-available P, the potential-P (HCl 25%), leaf N and P concentrations, the yield of sword bean. Increased rates of both forms of P fertilizer increased the soil pH values. As the soil used had low pH and very high exchangeable Al, hence, this result is most probably related to the addition of Ca2+ to the soil solution that resulted from the P fertiliser applied (liming effect), either from SP-36 (monocalcium phosphate) or PR (flour apatite). There was no difference in soil available P concentration due to the different in P fertilizer types, indicating that 4 months after the fertilizer application, the relatively insoluble Phosphate Rock had the same P solubility with SP-36. Increased rates of both forms of P fertilizer increased the sword bean yield. For the application of 0 kg P2O5 ha-1, although sword bean crops had pods, but, they did not give any seed. Whereas, at the addition of P fertilizer at the rate of 50, 100, and 150 kg P2O5 ha-1 for both P fertilizer types, the crops were able to give the seeds in the pods. [How to Cite: Achmad AR. 2015. Changes in Soil Available Phosphorus, Leaf Phosphorus Content and Yield of Sword Bean (Canavalia ensiformis (L.) DC.) by Application of SP-36 and Phosphate Rock on Acid Upland Soil of East Lampung. J Trop Soils 19: 29-36. Doi: 10.5400/jts.2015.20.1.29][Permalink/DOI: www.dx.doi.org/10.5400/jts.2015.20.1.29]

scholarly journals Effect of chicken manure on chemical properties of a Mollisol and tomato production

1969 ◽  
Vol 77 (3-4) ◽  
pp. 181-191 ◽  
Author(s):  
Julia M. O’Hallorans ◽  
Miguel A. Muñoz ◽  
Octavio Colberg
Keyword(s):  
Electrical Conductivity ◽  
Puerto Rico ◽  
Soil Ph ◽  
Chemical Properties ◽  
Chicken Manure ◽  
Available P ◽  
Tomato Production ◽  
Exchangeable K ◽  
Tomato Yield ◽  
Manure Treatment

An experiment was established on a San Antón soil (Cumulic Haplustolls) in southern Puerto Rico to evaluate the effect of chicken manure (0, 5, 10 and 15 t/ha) and nitrogen fertilizer (0, 56, 112 and 168 kg/h) on some soil chemical properties and tomato production. Chicken manure was broadcast and incorporated into the soil whereas urea, the nitrogen source, was applied by fertigation. A significant lineal effect was observed in exchangeable Mg2+ and K+, electrical conductivity and Olsen available P with chicken manure applications. In the check treatment (no manure), exchangeable Mg2+ was 2.54cmolc/kg; exchangeable K+, 0.99 cmol./kg; electrical conductivity, 0.79 mmhos/cm; and available P, 52.58 mg/kg. The application of 15 t/ha of chicken manure increased exchangeable Mg2+ to 2.70 cmolc/kg, exchangeable K+ to 1.29 cmolc/kg, electrical conductivity to 2.22 mmhos/cm and available P to 83.98 mg/kg. Soil pH decreased significantly with the same treatment from 7.50 in the check treatment to 6.98 in the 15 t/ha chicken manure treatment. Chicken manure increased soil exchangeable NO3- at a depth of 20 cm, but did not increase exchangeable NH4+.  Application of chicken manure did not increase tomato yield significantly; however, it increased significantly the number of large and medium fruits. It is suggested that an exchangeable NO3- content of about 15 to 20 mg/kg is adequate for optimum tomato production in a San Antón soil.

RESIDUAL EFFECTIVENESS OF MINJINGU PHOSPHATE ROCK AND FALLOW BIOMASS ON CROP YIELDS AND FINANCIAL RETURNS IN WESTERN KENYA

2006 ◽  
Vol 42 (3) ◽  
pp. 323-336 ◽  
Author(s):  
K. W. NDUNG'U ◽  
J. R. OKALEBO ◽  
C. O. OTHIENO ◽  
M. N. KIFUKO ◽  
A. K. KIPKOECH ◽  
...  
Keyword(s):  
Phosphate Rock ◽  
Crop Yields ◽  
Available P ◽  
Nitrogen And Phosphorus ◽  
Western Kenya ◽  
Grain Yields ◽  
Net Benefits ◽  
Maize Grain ◽  
Cropping Seasons ◽  
Minjingu Phosphate Rock

In western Kenya, severe nutrient depletion, especially that of nitrogen and phosphorus, has drastically reduced crop yields over the past two to three decades. The potential effects of P application, with a single direct application of Minjingu phosphate rock (MPR) at 20, 40 and 60 kg P ha−1, and fallow biomass in terms of nutrient replenishment on maize and bean yields were investigated on N and P deficient soils of western Kenya for six cropping seasons (three years). The agro-forestry shrubs tested were one season (six months) Crotalaria grahamiana and Tephrosia vogelii followed by maize monocrop. These fallow species were intercropped with beans in the 2000 long rains season to provide a food benefit to the farmer. Soil samples were taken at the end of each season and analyzed for soil pH and extractable P. The results showed that soil available P increased significantly following application of MPR. Significant increases in bean yields were obtained when 60 kg P ha−1 as MPR were applied, and contributed to a 260 % increase above the control. Significant maize grain yield increases were obtained when MPR was applied alone or in combination with fallow biomass as compared with treatments with either no external nutrient addition (control) or with fallow biomass alone in all seasons. The 60 kg P ha −1 MPR rate gave the highest cumulative maize grain yields (9.6 t ha−1) over the five consecutive maize growing seasons, followed by 40 kg P ha−1 (8.8 t ha−1). The residual benefits of MPR at modest rates of application (60 kg P ha−1) were found to persist in the soil for only three cropping seasons. Thereafter, there was a steady decline in soil chemical properties (pH and available P), grain yields and net benefits. The study demonstrated the need for frequent additions of P especially in the fourth consecutive season to ensure sustained availability of P, favorable pH, and increased crop yields and net benefits on the nutrient-depleted soils of western Kenya.

Effects of farmyard manure and phosphorus and potassium fertilizers on soil properties in rice-wheat rotation

1979 ◽  
Vol 92 (2) ◽  
pp. 359-362 ◽  
Author(s):  
G. N. Formoli ◽  
R. Prasad
Keyword(s):  
Field Experiment ◽  
Soil Properties ◽  
Soil Ph ◽  
Farmyard Manure ◽  
Available P ◽  
New Delhi ◽  
Potassium Fertilizer ◽  
Total N ◽  
Organic C ◽  
Phosphorus And Potassium

SummaryThe effects of farmyard manure (FYM) and P and K fertilizers on soil properties were studied at the end of a 3-year (1972–5) field experiment at New Delhi, India. Each year a crop of rice and wheat was grown. FYM was applied at 0 or 15 t/ha, phosphorus at 0, 30 and 60 kg P2O5/ha and potassium at 0 or 60 kg K2O/ha. Treatments included application of manure and fertilizer to rice or wheat alone or to both the crops. FYM application increased organic C, total N and available K and P in the soil, the effects being greater when both rice and wheat received FYM. Application of FYM slightly decreased the soil pH. Phosphorus and potassium fertilizer increased available P and K in the soil, respectively.

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