Influence of organic-mineral fertilization of an oxisol on soil chemical properties and Bracharia brizantha production

The use of organic-mineral fertilizer produced by the manufacturing industry of lysine and threonine amino acids can improve the fertility of tropical soils. The objective of this study was to evaluate the influence of different doses of the organic-mineral fertilizer named Ajifer L-14 on chemical properties and on the response with increased production of a forage on a Red Latosol in the northwestern region of São Paulo State, Brazil. A randomized block design was used with seven treatments and four replications. The treatments consisted of: T1- control (without application of Ajifer L-14); T2- control (natural vegetation); T3- mineral fertilization according to crop requirements and soil analysis (application of 1.35 kg plot-1 of urea, 2.20 single superphosphate, and 0.51 KCl, corresponding to 60 of N, 40 P2O5 and 30 kg ha-1 of K2O); T4- fertilization with Ajifer L-14 according to the recommendation resulting from the soil chemical analysis (40 L plot-1, corresponding to 60 kg ha-1 N); T5- fertilization with Ajifer L-14, at a rate of 150 % of the recommended values (60 L plot-1, corresponding to 90 kg ha-1 N); T6- fertilization with Ajifer L-14 at a rate of 50 % of the recommended values (20 L plot-1, corresponding to 30 kg ha-1 N); T7- fertilization with Ajifer L-14 at a rate of 125 % of the recommended values (50 L plot-1, corresponding to 75 kg ha-1 N); T8- fertilization with Ajifer L-14 at a rate of 75 % of the recommended values (30 L plot-1, corresponding to 45 kg ha-1 N). The following soil chemical properties were evaluated (layers 0.0-0.1 and 0.1-0.2 m): P, organic matter, pH, K+, Ca2+, Mg2+, cation exchange capacity, potential acidity, and base saturation. The application of this organic-mineral fertilizer does not influence the soil chemical properties. Regression analysis indicated a polynomial relationship between the application rates of organic-mineral fertilizer and the production of dry matter and crude protein of Bracharia Brizantha

Influence of different moisture regimes and n-fertilization on electrochemical changes and some nutrients in the leachate solution during growing period of rice plants

&lt;p&gt;A pot experiment was conducted in the greenhouse of NRC, Dokki, Giza, Egypt, using clay loam soil to study the effect of different moisture regimes (M1, M2 and M3) and fertilizer treatment(F0, F1, F2, F3, and F4) on electrochemical change and concentration of some nutrients in the leachate solution during growing period of rice plant (variety Sakha 102).&lt;/p&gt;&lt;p&gt;The important results could be summarized in the follows: PH values showed the highest decreases under all the fertilizer treatments when the moisture regime of M1 was used followed by M2 and M3 in descending order. Furthermore, pH values showed higher decreases when the fertilizer treatment of F3 was used followed by F4, F2, F1 and F0 in decreasing order.&lt;/p&gt;&lt;p&gt;Under all soil moisture regimes and fertilizer treatment Eh values sharply decreased during the 12 days after starting (DAS), then they decreased to the lowest values at 24 DAS. The soil moisture regimes decreased Eh values in soil solution during the growth period of rice plants. The highest decreases were obtained under soil moisture of M1 followed by M2 and M3 in descending order. The greatest decreases of Eh values were obtained by using the fertilizer treatment of F3 followed by F4, F2, F1 and F0 in descending order.&lt;/p&gt;&lt;p&gt;Results showed that , P, K+, Fe++ and Mn++ concentrations in soil solution were higher in the early stages of rice plans and reached a peak at 24 days after staring (DAS), then the concentrations of all the studied nutrients gradually decreased with increasing the growth period.&lt;/p&gt;&lt;p&gt;Inorganic N-fertilizer treatments (F1 and F2) gave higher nutrients concentrations under all soil moisture regimes as compared with N-organic fertilizer treatment alone (F4). Combination of organic and inorganic fertilizer (F3) gave the higher nutrients concentration in the leachate solutions followed by fertilizer treatments of F2, F1, F4 and F0 in decreasing order.&lt;/p&gt;&lt;p&gt;The highest values of , P, K+, Fe++ and Mn++ concentrations were obtained at 24 days after starting (DAS) by using the fertilizer treatment of F3 under soil moisture regime of M1 (F3 M1¬) followed by F3M2 and F3M3 in decreasing order, while the lowest values were obtained at 72DAS under soil moisture regime of M3 and unfertilized treatment F0 (M3F0).&lt;/p&gt;</jats:p

Uso fertilizante de resíduo da indústria processadora de goiabas Fertilizer use of guava processing industry waste

O resíduo da indústria processadora de goiabas vem sendo aplicado em algumas áreas, entretanto não é conhecido o seu efeito na fertilidade do solo. Foi realizado experimento em casa de vegetação, com o objetivo de avaliar o efeito da aplicação do resíduo da indústria processadora de goiabas na fertilidade do solo, tendo como planta-teste o milho. O delineamento experimental utilizado foi em blocos ao acaso, em esquema fatorial 5x2, com quatro repetições, combinando-se cinco doses do resíduo da indústria processadora de goiabas (0; 20; 40; 60 e 80 t ha-1) na presença e ausência de adubação mineral. A adição de resíduo da indústria processadora de goiabas propiciou aumento nos teores de P e K do solo. O resíduo da indústria processadora de goiabas é uma fonte de liberação lenta de N e P para as plantas.<br>The guava processing industry waste (GPIW) has been used in some areas, however is not known its effect on soil fertility. A greenhouse experiment was carried out to evaluate the effect of GPIW on soil fertility, using corn as testing plant. The experiment was in randomized blocks design combining five GPIW rates (0; 20; 40; 60 and 80 t ha-1) in the absence and the presence of mineral fertilization. The GPIW increased P and K concentration and behaved as a slow release source of N and P for corn