Record ID No. |
3103 |
Author(s) |
Rashidi Z., Zarea M J., Rejali F., Mehrabi A A. , 2010. |
Affiliation |
Faculty of Agriculture, Ilam University, P.O. Box 69315516, Ilam, Iran. e-mail: mjzarea@ymail.com |
Title |
Subsurface soil biological activity respond quickly to a cessation in tillage and integrated fertilizer management under dry land farming |
Source. Vol.(no):Page |
International Journal of Agricultural Technology. 6(4): 807-820p. |
Categories |
Mycorrhiza General |
Subjects |
Soil plant relations |
Sub-subjects |
Cropping effect |
Host |
Triticum aestivum |
Organism |
Bacillus coagulans |
Country |
Iran, Asia. |
Abstracts |
Beneficial of conventional tillage is not restricted to increase crop yield. Use of notillage (NT) improve and alter soil physical, chemical and biological activity that can be important towards sustainable agriculture. A deterrent for growers considering the transition to conservation tillage is the delay in soil response associated with the equilibration of the soil food web but subsurface can respond quickly to a cessation in tillage than surface soil. Although considerable literature exists on microbial and soil chemical changes under various tillage methods, little information exists on these changes under dry land farming conditions to a cessation in tillage. The objective of this study was to determine the quicker response of subsoil or surfacesoil to minimum tillage (MT) and conventional tillage (CT) and biofertilizers (Bacillus coagulans, B), Phosphorus fertilization (P) and integrated P and B (PB) under the wheat (Triticum aestivum L vr. Sardari) growing season. The experimental design was split plot laid out in a randomized block design with three replications that tillage practises was in the main plot. The field trial is located in the dryland semiarid crop. Three tillage practices implemented on a texturally uniform and level field site under winter wheat were: (i) conventional tillage (CT), with moldboard ploughing followed by harrowing once with a springtine harrow; (ii) reduced tillage (RTC), with ducksfoot cultivator with a springtine harrow, and (iii) with moldboard ploughing with the moldboard detached (RT). Results obtained showed that tillage methods and PB significantly affected mycorrhiza colonization rate and soil microbial activities. At 5-20 cm, alkaline phosphatase (ALP) enzymes and Dehydrogenase activity (DHA) was greater than at 0-5 cm when wheat was under RTC or RT. At 5-20 cm B inoculant and PB increased ALP and DHA, respectivily. Result showed no significantly deifier in Substrate respiration (SR) in the 0-to 5-cm layer when wheat was under MT OR CT. Substrate-induced respiration (SIR) was higher in the 0- to 5-cm layer when wheat was under MT. SR and SIR were higher when wheat was inoculated with BP. Result indicated that transition to conservation tillage is the delay in soil response but subsurface soil can respond quickly to a cessation in tillage under the semiarid area condition. |