Abstract

QUIROGA-GARZA, Héctor Mario; CUETO-WONG, José Antonio  and  FIGUEROA-VIRAMONTES, Uriel. Manure and Fertilizer Effects on ¹⁵N-Nitrogen Recovery and Soil Electrical Conductivity. Terra Latinoam [online]. 2011, vol.29, n.2, pp.201-209. ISSN 2395-8030.

With the aim to quantify the recovery of the nitrogen applied as chemical fertilizer (15N) in combination with manure and his effects in the accumulation of salt in a soil without drainage, a study was established in the “La Laguna” Research Station of INIFAP. Four manure doses: 0, 30, 60 and 120 Mg ha-1 and two fertilizer doses: 120 and 240 kg N ha-1 were studied, enriched 15N (NH4)2 SO4 (10% atom excess) was used. Pots of PVC pipe 15.24 cm diameter and 50 cm height were used. The treatments were established in a factorial arrangement with a distribution in a randomized complete block design with three replications. The study was conducted under irrigation without leaching for three consecutive crop cycles. Dry matter (DM) yield increased with increasing manure and fertilizer doses, but as salt contents buildup DM decreased with each crop cycle. Nitrogen recovery from fertilizer was 29-30% during the first crop, respectively for the two fertilizer rates; and as salt buildup, recovery dropped to 1.8 to 2.4% in the second crop, and to 0.4 to 0.5% in the third crop. The electrical conductivity (EC) in, the final leachate and soil at the end of the three crops, increased as the manure and fertilizer doses did, reaching an average value of 6.8 and 3.0 dS m-1 in the leachate and soil, respectively. It is necessary to define a program strategically designed for using the manure in the Comarca Lagunera, since the benefits of this resource are evident. However, to prevent salt buildup the application of this program must be accompanied with a proper irrigation management, especially with the pressurized systems to allow a proper salt wash out of the root zone and get the manure benefits.

Keywords : ammonium sulfate; ryegrass; sudangrass; nitrogen contents.

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