POTATO PRODUCTION BY ORGANIC FARMING 2. ROLE OF ORGANIC FERTILIZATION AND WHEY ON NPK AVAILABILITY AND PERCENTAGE OF MYCORRHIZA INFECTION

H. AI. Sahaf, F.; S. Atee, Alaa

	POTATO PRODUCTION BY ORGANIC FARMING 2. ROLE OF ORGANIC FERTILIZATION AND WHEY ON NPK AVAILABILITY AND PERCENTAGE OF MYCORRHIZA INFECTION
The Iraqi Journal of Agricultural Science
Article 1, Volume 38, Issue 4, 2007, Pages 52-64
Authors
F. H. AI. Sahaf; Alaa S. Atee
Abstract
A field experiment was conducted at the fields of the College Agric. Abu -Ghraib to investigate the role of soil applied organic matter and whey in the availability of N, P, and K, and the percentage of root infection by mycorrhiza fungi. The treatment included cow manure at levels 0 , 10% and 20% WAV , poultry residues at levels 0 . 10% and 20%, and whey mixed with irrigation at concentrations 0 , 10% and 20% in randomized complete block design with three replicates. The control treatment represented by chemical fertilizer application as recommended (1000 kg NPK/ha 27:27:0). Soil samples were collected 30 , 60 and 90 days after potato planting . Root samples also were taken for determination of mycorrhiza infection percentage during spring season only. Results showed that available N and P concentrations were significantly increased with the increasing organic fertilizer levels up to 20% and 20% whey. The application of 20% poultry residues with 20% whey resulted in 189.45 and 179.31 mg N/Ug and 204.22 and 212.22 nig P/kg for spring and fall season, respectively. However, highest concentrations of K were 423.65 and 432.21 mg k/ha resulted from cow manure at 20% with 20% of whey for spring and fall season, respectively after 90 days of planting. The 20% of whey and 20% organic fertilizer resulted in the highest percentage of root infection by mycorrhiza (72.00%).

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