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Effect of Irrigation and Nutrition of Copper and Molybdenum on Egyptian Clover (Trifolium alexandrnium L.)

Water Requirements and Field Irrig., Agric. Res. Cent., Sakha, Kafr El-Sheikh, Egypt. Soil, Water and Environ. Res. Inst., Agric. Res. Cent., Giza, Egypt

* Corresponding author (elbably{at}egyptnetwork.com)

Received for publication August 22, 2001. The present investigation was conducted at Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt, in two growing seasons of 1998–1999 and 1999–2000 to estimate the productivity of Egyptian clover (Trifolium alexandrnium L.) as influenced by number of irrigations and addition of the micronutrients Cu and Mo. Irrigation treatments were one, two, and three irrigations between cuttings while micronutrient treatments were 0.95 kg ha^-1 copper sulfate and 0.95 kg ha^-1 ammonium molybdate at a rate of 950 L ha^-1. The combined analysis indicated that three irrigation events between cuttings significantly increased total cuttings of fresh and dry yields (FY and DY, respectively) to 104.14 and 19.48 t ha^-1, respectively. On the other hand, it decreased water use efficiency (WUE). As for foliar application, results showed that 0.95 kg ha^-1 ammonium molybdate significantly increased seasonal total of FY, DY, and WUE by 16.48, 18.63, and 17.65%, respectively. Water consumptive use values were 59.62, 48.98, and 37.98 cm, over both seasons, for three, two, and one irrigation time(s) between cuttings, respectively. Under shortage of irrigation water, single irrigation between cuttings could be useful because it produced 91.97 and 16.75 t ha ^-1 FY and DY, respectively; consumed 37.98 cm (170 d)^-1; and gave higher WUE of 440.9 kg of dry matter (DM) ha^-1 cm^-1 water consumed compared with irrigation three times, which produced 104.14 and 19.48 t ha^-1 GY and DY, respectively; consumed 59.62 cm (170 d)^-1; and gave lower WUE of 326.5 kg of DM ha^-1 cm^-1 water consumed, over both seasons.

Abbreviations: CU, water consumptive use • DM, dry matter • DY, dry yield • FY, fresh yield • WUE, water use efficiency

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