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@article{Shittu_Adeboye_Oyedele_Murtadha_Lamidi_2024, title={Effects of Urea Fertilizer on Yield and Water Productivity of Amaranthus viridis in the Tropical Rainforest and the Derived Savanna of Nigeria}, volume={50}, url={https://tjs.udsm.ac.tz/index.php/tjs/article/view/1824}, DOI={10.4314/tjs.v50i2.12}, abstractNote={<p class="western" lang="en-GB" align="justify"><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;">The experiment was conducted using a lysimeter in June, 2014 in Saki (Derived Savanna) and Ile-Ife (Tropical Rainforest) to determine the crop coefficients and the effects of Urea fertilizer on the yield and water productivity of </span></span><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;"><em>Amaranthus viridis</em></span></span><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;"> in Nigeria</span></span><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;">. The loamy sandy soil in the top 15 cm was sampled, air-dried and analysed. Eighteen (18) kg of the air-dried and sieved soils were weighed into the thirty-two (32) lysimeters. Drill method was used for the sowing and the seeds were spread within 2 cm in the lysimeter. Urea fertilizer was applied at 0, 40, 80 and 160 kg N/ha twice during the growing season. The crop coefficients at the initial, mid, and late stages ranged from 0.15 to 0.41 in Ile-Ife, while in Saki, they ranged from 0.29 to 1.15 under Urea fertilizer. In Saki, the peak crop evapotranspiration was 1.21 mm/day for 0 kg N/ha of Urea while in the Ile-Ife, the crop evapotranspiration was 1.83 mm/day for 160 Kg N/ha of Urea. Water productivity in Saki and Ile-Ife were 45.47 kg/ha mm and 18.58 kg/ha mm respectively for 160 kg N/ha. This implies that A</span></span><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;"><em>maranthus viridis</em></span></span><span style="font-family: Times New Roman, sans-serif;"><span style="font-size: small;"> required more water during canopy expansion and flowering in Ile-Ife than in Saki. </span></span></p>}, number={2}, journal={Tanzania Journal of Science}, author={Shittu, Kabiru A and Adeboye, Omotayo B and Oyedele, Durodoluwa J and Murtadha, Abdul-Salam M and Lamidi, Wasiu A}, year={2024}, month={Jul.}, pages={323–333} }