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  • 1
    Electronic Resource
    Electronic Resource
    Effect of nitrogen, phosphorus and molybdenum application on growth and symbiotic N2-fixation of groundnut in an acid sandy soil in Niger (1992)
    Springer
    Nutrient cycling in agroecosystems 31 (1992), S. 69-77 
    Details
    ISSN: 1573-0867
    Keywords: Molybdenum availability ; symbiotic N2-fixation ; Arachis hypogaea ; acetylene reduction assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two field experiments were conducted in 1988 and 1989 on an acid sandy soil in Niger, West Africa, to assess the effect of phosphorus (P), nitrogen (N) and micronutrient (MN) application on growth and symbiotic N2-fixation of groundnut (Arachis hypogaea L.). Phosphorus fertilizer (16 kg P ha−1) did not affect pod yields. Addition of MN fertilizer (100 kg ‘Fetrilon Combi 1’ ha−1; P + MN) containing 0.1% molybdenum (Mo) increased pod yield by 37–86%. Nitrogen concentration in shoots at mid pod filling (72 days after planting) were higher in P + MN than in P − MN fertilizer treatment. Total N uptake increased from 53 (only P) to 108 kg N ha−1 by additional MN application. Seed pelleting (P + MoSP) with 100 g Mo ha−1 (MoO3) increased nitrogenase activity (NA) by a factor of 2–4 compared to P treatment only. The increase in NA was mainly due to increase in nodule dry weight and to a lesser extent to increase in specific nitrogenase activity (SNA) per unit nodule dry weight. The higher NA of the P + MoSP treatment was associated with a higher total N uptake (55%) and pod yield (24%). Compared to P + MoSP or P + MN treatments application of N by mineral fertilizer (60 kg N ha−1) or farmyard manure (130 kg N ha−1) increased only yield of shoot dry matter but not pod dry matter. Plants supplied with N decreased soil water content more and were less drought tolerant than plants supplied with Mo. The data suggest that on the acid sandy soils in Niger N deficiency was a major constraint for groundnut production, and Mo availability in soils was insufficient to meet the Mo requirement for symbiotic N2-fixation of groundnut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064229
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  • 2
    Electronic Resource
    Electronic Resource
    Long- and short-term effects of crop residues on aluminum toxicity, phosphorus availability and growth of pearl millet in an acid sandy soil (1991)
    Springer
    Plant and soil 136 (1991), S. 215-223 
    Details
    ISSN: 1573-5036
    Keywords: Al complexation ; Al tolerance ; crop residues ; Pennisetum glaucum ; P mobilization ; soil solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a long-term field experiment millet straw application (+CR) increased soil pH and base saturation and strongly improved pearl millet (Pennisetum glaucum L.) growth on acid sandy soils. Aluminum (Al) toxicity may be responsible for poor millet growth in plots without crop residues (−CR). Laboratory experiments were conducted to verify this assumption. The concentrations of labile Al (8-hydroxyquinoline, 15 sec) in equilibrium soil solutions of top soil samples from field plots were 14.0 and 0.6 μM in unfertilized samples of −CR and +CR soil, respectively. The corresponding values for labile Al in fertilized (NPK) samples were 51.8 and 11.0 μM, respectively. A short-term (14 days) incubation of −CR soil with ground millet straw (0.1% w/w) increased soil solution pH and decreased total and labile Al in the soil solution by more than 44%. In a water-culture experiment with increasing concentrations of Al (0–60 μM) pearl millet proved to be very Al-tolerant compared to cowpea, peanut and soybean. A short-term (12 days) pot experiment with the incubated soil showed that root growth of pearl millet is not restricted by Al toxicity in the acid soils from Niger, but that after millet straw incubation root growth is considerably enhanced. Phosphorus (P) concentration in the soil solution was about three times higher in +CR (1.75 μM) than in −CR (0.52 μM) top soil. Since P is the most growth-limiting nutrient in those soils, the beneficial effect of crop residues on pearl millet is likely due to improvement of P nutrition by both increase in P mobility in the soil and enhancement of root growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02150052
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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