- Authors:
- Eckard, R. J.
- Browne, N. A.
- Behrendt, R.
- Kingwell, R. S.
- Source: Animal Feed Science and Technology
- Volume: 166-167
- Year: 2011
- Authors:
- Grace, P.
- Barton, L.
- Chen, D.
- Eckard, R.
- Kelly, K.
- Officer, S.
- Scheer, C.
- Schwenke, G.
- Wang, W.
- Source: Soil Solutions for a Changing World
- Year: 2011
- Authors:
- Huggins, T.
- Kelly, K.
- Suter, H.
- Eckard, R.
- Source: The CCRSPI Conference
- Year: 2011
- Authors:
- Source: Journal of the Science of Food and Agriculture
- Volume: (in press).
- Year: 2011
- Authors:
- Chen, D.
- Mahoney, M.
- Davies, R.
- Sultana, H.
- Suter, H.
- Source: The CCRSPI Conference
- Year: 2011
- Authors:
- Al-Mohammadi, F.
- Al-Zu'bi, Y.
- Source: Journal of Agricultural Science and Technology
- Volume: 13
- Issue: 2
- Year: 2011
- Summary: This research was conducted under greenhouse conditions to evaluate the optimum combination of irrigation and fertilizer levels to attain the best yield and quality of tomato crop. The experiment was conducted by using a split-plot design with three replicates. Irrigation levels were applied to the main plots and fertilizer levels to the sub-plots. For each experimental unit, the irrigation levels were W1=8 mm/day, W2=7 mm/day, W3=6 mm/day, and W4=5 mm/day. Fertilizers treatments varied during the growing season. For the period after transplanting till flowering, the treatments consisted of weekly applications of F1=(N1, P1, K1, respectively, 9.8, 6.13, 7.35 g/plot), F2=(N2, P1, K1, respectively,14.7, 6.13, 7.35 g/plot), F3=(N2, P2, K1, respectively, 14.7, 9.19, 7.35 g/plot), and F4=(N2, P2, K2, respectively, 14.7, 9.19, 11.0 g/plot). Fertilizer levels were increased as the plants developed during the growing season. Plant height and the number of flowers per tomato plant were measured during the growing season and at harvesting time. Random samples of tomato leaves and fruits were taken from each experimental plot to determine the percentage of dry matter, total nitrogen, phosphorus, and potassium contents of fruits and leaves. Total yield during harvesting period and average fruit weight were also measured. Results indicated that irrigation and fertilizer levels had significant effects on the number of flowers per plant and W1F2 combination was significantly the most effective treatment compared to the other treatments. Plant height was not affected significantly by any treatment. The total yield significantly increased in W3F1 treatment. Average fruit weight was significantly higher in W2F3 as compared to the other treatments. The percentage of dry matter was significantly affected by the treatment W3F3 in both leaves and fruits. Total leaf contests of nitrogen, phosphorus, and potassium significantly increased in W2F4 treatment. Total nitrogen content in tomato fruits did not show any significant difference among different treatments, whereas fruit phosphorus and potassium contents significantly increased in W2F3 and W4F4 treatments.
- Authors:
- Source: Biomass and Bioenergy
- Volume: 35
- Issue: 5
- Year: 2011
- Authors:
- Rodriguez, L. C.
- May, B.
- Herr, A.
- Farine, D.
- O'Connell, D.
- Source: Energy Policy
- Volume: 39
- Issue: 4
- Year: 2011
- Authors:
- Abdellaoui, Z.
- Teskrat, H.
- Belhadj, A.
- Zaghouane, O.
- Source: Options Mediterranennes
- Issue: 96
- Year: 2011
- Summary: The comparative study of reduced tillage, zero tillage and conventional tillage conducted during 5 years in the sub-humid zone of Algeria showed a difference of the development of durum wheat and changes of some soil characteristics. In the first year experiment, the yield was higher in the conventional tillage compared with reduced tillage and no-tillage. After the 3rd year, better yields were obtained with no-till with a 10 q/ha rise compared with conventional tillage. This confirms that the production of wheat under no till is improved year by year. However, after the 5th year of experiment, the high soil moisture at the seeding has generated lower yields. The different tillage practices have generated differences in soil characteristics. In fact a better water retention and a better content in organic matter in the three studied layers, were observed with no till. The bulk density shows a clear variation at the surface layer (0-8 cm) with the highest density in the conventional tillage.
- Authors:
- Brito, I.
- Carvalho, M. de
- Goss, M. J.
- Source: Soil Use and Management
- Volume: 27
- Issue: 3
- Year: 2011
- Summary: The potential to manage arbuscular mycorrhizal colonization within Mediterranean agricultural systems depends on the summer survival of extraradical mycelium. To investigate this further a three-stage experiment was undertaken. The first stage was the creation of two contrasting levels of extraradical mycelium development, achieved by two contrasting levels of soil disturbance (typifying full tillage and no-till). In the second stage, this differential mycelial inoculum was subjected to Mediterranean summer temperature and soil water regimes representing the post-harvest fallow. During the third stage, corresponding to the next growing season, survival was evaluated without further soil disturbance (typifying no-till conditions) using wheat as host crop. The results clearly indicate that the extraradical mycelium survived the prevailing summer conditions. The knowledge that extraradical mycelium can survive the Mediterranean summer encourages the use of tillage systems that minimize mechanical disturbance of the soil, such as no-till. The results from this study suggest that by making the appropriate choice of crops to establish a mycorrhizal-supportive rotation there can be opportunities for agro-ecosystem management to benefit from the symbiotic relationship.
