Distribution of wild annual legume species in Morocco and relationship with soil and climatic factors

1991 ◽  
Vol 42 (7) ◽  
pp. 1217 ◽  
Author(s):  
PE Beale ◽  
A Lahlou ◽  
M Bounejmate
Keyword(s):  
Climatic Factors ◽  
Soil Nutrient ◽  
Clay Content ◽  
Nutrient Status ◽  
Significant Finding ◽  
Legume Species ◽  
Soil Nutrient Status ◽  
Pod Yield ◽  
The Subject ◽  
Pasture Plant

Pods and seed of all annual legume species and a soil sample were collected within a 1 m2 sample area at each of 161 sites in Morocco, and the surrounding area of approximately 0.5 ha intensively searched for all species. This paper reports findings for all genera except Medicago and Trifolium which are the subject of separate papers. Annual legumes were found at 138 sites and 15 genera and 31 species were identified. Scorpiurus sulcata, the most prolific species, was found at 117 sites, followed by Astragalus hamosus (52 sites) and Hippocrepis unisiliquosa (30 sites). The distribution of the genera was related to pH, sand and clay content, altitude and rainfall, but very little to soil nutrient status. The highest pod yield was 890 kg/ha for Scorpiurus sulcata whilst Hedysarum coronarium had the highest average pod yield of 392 kg/ha but occurred at only 3 sites. Scorpiurus had the highest average pod yield of any genus that occurred at more than just a few sites. Overall pod yields were strongly related to sand and clay content of the soil, rainfall and minimum temperature and to a lesser extent, to altitude and soil potash. The most significant finding was the widespread distribution of Scorpiurus sulcata which did not appear to have any specific requirements for soil type, soil nutrient status, altitude or climate. The need to assess Scorpiurus sulcata as a potential pasture plant for Morocco and other areas of similar climate is clearly indicated.

Influence of phosphorus and bio-fertilizers on growth and yield of cowpea [Vigna unguiculata (L.) Walp.] in acidic soil of NEH region of India

2017 ◽  
Author(s):  
M. A. Nadeem ◽  
Vikas Singh ◽  
R. K. Dubey ◽  
A. K. Pandey ◽  
Barun Singh ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Vigna Unguiculata ◽  
Dry Matter ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Growth And Yield ◽  
Soil Nutrient Status ◽  
Area Index ◽  
Available N ◽  
Pod Yield

A field experiment was carried out on cowpea (Vigna unguiculata (L.) variety Kashi Kanchan during summer season at the experimental farm, department of Vegetable Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh. The experiment was laid out in factorial complete randomized block design with 12 treatments i.e. three levels of phosphorus [control 0 kg(P0), 20 kg (P1) and 40 kg (P2) /ha] and four levels of bio-fertilizer [control (B0), Rhizobium10 ml/kg seed(B1), PSB 10 ml/kg seed (B2) and Rhizobium + PSB both 10 ml/kg seed (B3)] with three replications. The uniform dose of nitrogen (N) and potassium (K) @ 20 kg/ha along with 10 t/ha FYM (Farm Yard Manure) were applied to all the treatments. Result indicated that the application of P2 (40 kg P/ha) significantly increased the plant height, leaf area index, stem girth, number of nodules per plant, number of branches per plant , total dry matter, pod yield, available soil nutrient status viz., pH, N, P, K, organic carbon and NPK content in plant after harvesting. Similarly, seed inoculation with B3 (Rhizobium + PSB) significantly enhanced the growth, yield, soil nutrient status and nutrient content in plant over single inoculation of Rhizobium and PSB. Combined inoculation of seed with Rhizobium + PSB (B3) along with 40 kg P/ha (P2) significantly increased the stem girth (1.84 cm), total dry matter (13.91g/plant), green pod yield (196.37g/plant and 120.90q/ha), soil nutrient status viz., pH(6.20), available N (370.89 kg/ha), available P (38.57 kg/ha), available K (168.77 kg/ha), organic carbon (2.80%) and N, P and K (0.17%, 0.16% and 0.39%) content over rest of treatment combination.

scholarly journals Underestimation of boreal soil carbon stocks by mathematical soil carbon models linked to soil nutrient status

2016 ◽  
Vol 13 (15) ◽  
pp. 4439-4459 ◽  
Author(s):  
Boris Ťupek ◽  
Carina A. Ortiz ◽  
Shoji Hashimoto ◽  
Johan Stendahl ◽  
Jonas Dahlgren ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Soil Nutrient ◽  
Clay Content ◽  
Nutrient Status ◽  
Carbon Dioxide Exchange ◽  
Co2 Efflux ◽  
Soil Nutrient Status ◽  
Data Set ◽  
Soc Stock ◽  
Soc Stocks

Abstract. Inaccurate estimate of the largest terrestrial carbon pool, soil organic carbon (SOC) stock, is the major source of uncertainty in simulating feedback of climate warming on ecosystem–atmosphere carbon dioxide exchange by process-based ecosystem and soil carbon models. Although the models need to simplify complex environmental processes of soil carbon sequestration, in a large mosaic of environments a missing key driver could lead to a modeling bias in predictions of SOC stock change.We aimed to evaluate SOC stock estimates of process-based models (Yasso07, Q, and CENTURY soil sub-model v4) against a massive Swedish forest soil inventory data set (3230 samples) organized by a recursive partitioning method into distinct soil groups with underlying SOC stock development linked to physicochemical conditions.For two-thirds of measurements all models predicted accurate SOC stock levels regardless of the detail of input data, e.g., whether they ignored or included soil properties. However, in fertile sites with high N deposition, high cation exchange capacity, or moderately increased soil water content, Yasso07 and Q models underestimated SOC stocks. In comparison to Yasso07 and Q, accounting for the site-specific soil characteristics (e. g. clay content and topsoil mineral N) by CENTURY improved SOC stock estimates for sites with high clay content, but not for sites with high N deposition.Our analysis suggested that the soils with poorly predicted SOC stocks, as characterized by the high nutrient status and well-sorted parent material, indeed have had other predominant drivers of SOC stabilization lacking in the models, presumably the mycorrhizal organic uptake and organo-mineral stabilization processes. Our results imply that the role of soil nutrient status as regulator of organic matter mineralization has to be re-evaluated, since correct SOC stocks are decisive for predicting future SOC change and soil CO2 efflux.

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