אסיף מאגר המחקר החקלאי

Effect of nitrogen form at various levels of potassium, on the Meloidogyne-Fusarium wilt complex in muskmelon

Year:

1984

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Volume :

81

Co-Authors:

Spiegel, Y., Dept. of Nematology, ARO, The Volcani Center, P.O.B. 6, Bet Dagan, Israel
Netzer, D., Dept. of Plant Pathology, ARO, The Volcani Center, P.O.B. 6, Bet Dagan, Israel

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Abstract:

The influence of various potassium concentration and of nitrate or ammonium was evaluated on non inoculated muskmelon plants and on plants inoculated with the Fusarium wilt pathogen (F), the root-knot nematode (Meloidogyne javanica) (Nem), or a combination of both pathogens (F+Nem). Increasing potassium concentrations raised top fresh weights (TFW) in all four groups. Nitrate fertilized plants weighed more than plants receiving ammonium, independent of the K+ level in the medium. In the Nem+F infected plants TFW values were one and half to two times greater in those receiving the nitrate than in those receiving the ammonium. Number of nematodes in the roots were not affected by nutritional difference. In the ammonium fertilized F and Nem+F plants 30% more wilting was found than after nitrate application. Irrespective of the form of nitrogen that was applied accumulation of N, P and K was found in the roots of the Nem+F and/or Nem plants, while in the shoots Ca, Mg, Na and P accumulated and K was depleted. © 1984 Martinus Nijhoff/Dr W. Junk Publishers.

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