Long-term Effects of the Continuous Cultivation of a Tropical Ultisol in Southwestern Nigeria

1989 ◽  
Vol 25 (2) ◽  
pp. 207-215 ◽  
Author(s):  
A. Olu Obi
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Nitrogen Fertilizer ◽  
Continuous Cultivation ◽  
Continuous Cropping ◽  
Long Term Effects ◽  
Southwestern Nigeria ◽  
Continuous Use ◽  
Exchange Acidity

SUMMARYContinuous cropping of a tropical Ultisol with or without nitrogen fertilizer increased soil acidification and reduced soil organic matter and productivity. Addition of nitrogen fertilizer failed to increase yields. This was apparently due to the decline in soil pH, an increase in the amount of soluble aluminium, and consequent inefficient utilization of added nutrients. Continuous use of ammonium sulphate as a nitrogen source hastened the development of both surface and subsoil exchange acidity.

Long-term effects of elevated nitrogen on forest soil organic matter stability

2004 ◽  
Vol 70 (2) ◽  
pp. 229-252 ◽  
Author(s):  
Christopher Swanston ◽  
Peter S. Homann ◽  
Bruce A. Caldwell ◽  
David D. Myrold ◽  
Lisa Ganio ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Forest Soil ◽  
Long Term Effects ◽  
Forest Soil Organic Matter

Long-term effects of croppedvs. fallow and fertilizer amendments on soil organic matter II. Nitrogen

2005 ◽  
Vol 168 (2) ◽  
pp. 212-218 ◽  
Author(s):  
Rajinder Singh Antil ◽  
Martin H. Gerzabek ◽  
Georg Haberhauer ◽  
Gerfried Eder
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Long Term Effects

Long-term effects of manure and fertilization on soil organic matter and quality parameters of a calcareous soil in NW China

2007 ◽  
Vol 170 (2) ◽  
pp. 234-243 ◽  
Author(s):  
Sheng-Mao Yang ◽  
Sukhdev S. Malhi ◽  
Feng-Min Li ◽  
Dong-Rang Suo ◽  
Ming-Gang Xu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Calcareous Soil ◽  
Quality Parameters ◽  
Long Term Effects ◽  
Nw China

A long-term nitrogen fertilizer gradient has little effect on soil organic matter in a high-intensity maize production system

2014 ◽  
Vol 20 (4) ◽  
pp. 1339-1350 ◽  
Author(s):  
Kimberly H. Brown ◽  
Elizabeth M. Bach ◽  
Rhae A. Drijber ◽  
Kirsten S. Hofmockel ◽  
Elizabeth S. Jeske ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Nitrogen Fertilizer ◽  
Production System ◽  
High Intensity ◽  
Maize Production

Long-term effects of NPK fertiliser and manure on soil fertility and a sorghum - wheat farming system

2007 ◽  
Vol 47 (6) ◽  
pp. 700 ◽  
Author(s):  
M. C. Manna ◽  
A. Swarup ◽  
R. H. Wanjari ◽  
H. N. Ravankar
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Soil Organic Matter ◽  
Microbial Biomass ◽  
Aggregate Size ◽  
Microbial Biomass C ◽  
Continuous Cropping ◽  
C And N ◽  
Organic Matter Fractions

Yield decline or stagnation under long-term cultivation and its relationship with soil organic matter fractions are rarely considered. To understand this phenomenon, soil organic matter fractions and soil aggregate size distribution were studied in a long-term experiment at Akola, in a Vertisol in a semiarid tropical environment. For 14 years, the following fertiliser treatments were compared with undisturbed fallow plots: unfertilised (control), 100% recommended rates of N, NP, NPK (N : P : K ratios of 100 : 21.8 : 18.2 and 120 : 26.2 : 50 kg/ha for sorghum and wheat, respectively) and 100% NPK plus farmyard manure (FYM) and continuous cropping with a sorghum (Sorghum bicolor L. Moench) and wheat (Triticum aestivum L.) system during 1988–2001. The significant negative yield trend was observed in unbalanced use of inorganic N application for both crops. However, yields were maintained when NPK and NPK + FYM were applied. Results showed that soil organic C and total N in the unfertilised plot decreased by 21.7 and 18.2%, compared to the initial value, at a depth of 0–15 cm. Depletion of large macroaggregates (>2 mm) accounted for 22–81% of the total mass of aggregates in N, NP and unfertilised control plots compared to fallow plots. Irrespective of treatments, small macroaggregates (0.25–2 mm) dominated aggregate size distribution (56–71%), followed by microaggregates (0.053–0.25 mm, 18–37%). Active fractions, such as microbial biomass C, microbial biomass N, hot water soluble C and N, and acid hydrolysable carbohydrates were greater in NPK and NPK + FYM treatments than in the control. Carbon and N mineralisation were greater in small macroaggregates than microaggregates. Particulate organic matter C (POMC) and N (POMN) were significantly correlated (P < 0.01) with water-stable aggregate C and N (0.25–2 mm size classes), respectively. It was further observed that POMC and POMN were significantly greater in NPK and NPK + FYM plots than N and NP treated plots. Microbial biomass C was positively correlated with acid-hydrolysable carbohydrates (r = 0.79, P < 0.05). Continuous cropping and fertiliser use also influenced humic acid C and fulvic acid C fractions of the soil organic matter. Acid-hydrolysable N proportion in humic acid was greater than fulvic acid and it was greatest in NPK + FYM treatments. Continuous application of 100% NPK + FYM could restore soil organic carbon (SOC) to a new equilibrium level much earlier (t = 1/k, 2.4 years) than N (t = 1/k, 25.7 years), NP (t = 1/k, 8.1 years) and NPK (t = 1/k, 5.02 years). In conclusion, integrated use of NPK with FYM would be vital to obtain sustainable yields without deteriorating soil quality.

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