THE EFFECT OF ADDING DIFFERENT LEVELS AND SOURCES OF NITROGEN FERTILIZERS ON NITROGEN CONCENTRATION, UPTAKE, AND TOTAL YIELD OF TOMATO PLANTS (SOLANUM ESCULENTUM L.) UNDER GREENHOUSE CONDITIONS
Keywords:
Nitrogenous fertilizers, N concentration in leaves, amountAbstract
A field experiment was conducted at the agricultural Winter season 2021- 2022 in a green house using tomato crop to study the effect of adding different levels of various types of nitrogen fertilizers and two levels of organic fertilizer on some growth and yield characteristics of tomatoes. The results showed the superiority of sulfur-coated Urea fertilizer at the third level (100 kg N. ha-1 ) in terms of nitrogen concentration in tomato plant leaves, with values of 41.36 and 44.12 for the organic fertilizer levels of 20 and 40 tons. ha-1 , respectively, at the second date (December) of the measurement period compared to other dates. Also, sulfur-coated Urea fertilizer significantly outperformed other types of fertilizers in terms of nitrogen uptake, and the third level of this fertilizer achieved the highest rates with values of 148.85 kg N. ha-1 for the addition level of 20 tons. ha-1 of organic matter, while the addition level of 40 tons. ha-1 of organic matter did not have a significant effect on this trait. The results also indicate a significant superiority of sulfur-coated Urea fertilizer at the high level in the total yield of tomato plants, with values of 50.58 and 60.00 tons.ha-1 for the addition levels of 20 and 40 tons. ha-1 restpectively
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