ABSTRACT Through a long-term micro-area positioning experiment (2006-2017), the precise fertilization locations of spring maize (Zea mays L.) in Jilin, China, were investigated using an embedded cement bucket pot. The effects of different fertilization placements and additional application of organic manure on maize yield, biomass, grain nutrient uptake, and soil fertility were examined. Six treatments were designed: base fertilizer + topdressing shallow application (BF1TD1); base fertilizer deep + topdressing shallow application (BF2TD1); base fertilizer + topdressing deep application (BF1TD2); base fertilizer deep + topdressing deep application (BF2TD2); base fertilizer + topdressing + organic manure shallow application (BF1TD1 + OS); and base fertilizer + topdressing shallow application + organic manure deep application (BF1TD1 + OD). After 12 years of continuous experimentation, the findings revealed that BF2TD2, BF1TD1 + OS, and BF1TD1 + OD exhibited 10.59 %, 25.17 %, and 29.34 % higher average yields than BF1TD1, respectively. Deep topdressing was more beneficial in increasing maize yield and nutrient accumulation, and additionally, increasing the use of organic fertilizer enhanced plant biomass and nutrient uptake. Over the 12 years considered, the soil organic matter in the 0-20 cm and 20-40 cm layers increased by 45.96 % and 80.61 %, respectively, and the soil pH increased from 0.38 to 0.48. In general, the deep application of organic manure was more beneficial for soil retention as it can increase soil fertility in the 0-40 cm layer. Considering the high yield and nutrient absorption and utilization of maize, technical advancement for soil fertilizer in whole-field tillage layers was crucial. longterm long term microarea micro area 20062017, 20062017 2006 2017 , (2006-2017) Zea L. L Jilin China pot uptake examined designed BFTD BF TD (BF1TD1) BF2TD1 (BF2TD1) BF1TD2 (BF1TD2) BF2TD2 (BF2TD2) (BF1TD OS OS) OD. . OD) 1 experimentation BF1TD 1059 10 59 10.5 2517 25 17 25.1 2934 29 34 29.3 respectively accumulation additionally considered 020 0 20 0-2 2040 40 20-4 4596 45 96 45.9 8061 80 61 80.6 038 38 0.3 048 48 0.48 general 040 0-4 layer wholefield whole field crucial 2006201 200 201 (2006-2017 BF2TD (BF2TD1 (BF1TD2 (BF2TD2 105 5 10. 251 2 25. 293 3 29. 02 0- 204 4 20- 459 9 45. 806 8 6 80. 03 0. 04 0.4 200620 (2006-201 (BF2TD 20062 (2006-20 (2006-2 (2006- (2006 (200 (20 (2 (

Abstract In order to explore the distribution and transfer of lead elements in soil and rice in the five regions of Chahayang, Wuchang, Fangzheng, Xiangshui and Jiansanjiang in Heilongjiang Province, and analyze the impact of rice intake on human health, the samples were tested by ICP-MS. Modeling the lead-element transfer in the soil-rice system, using the Nemero comprehensive pollution index method and the health risk assessment model to evaluate the lead pollution status of rice in the study area and its health risks to adults and children. The results showed that the average content of lead in rice in the study area was Chahayang 0.02 mg/kg, Wuchang 0.03 mg/kg, Fangzheng 0.017 mg/kg, Xiangshui 0.023 mg/kg and Jiansanjiang. 0.024 mg/kg did not exceed the lead content limit specified by China's National Food Hygiene Standard (0.2 mg/kg); Based on the prediction model of heavy metal lead content, pH value, and organic matter in the soil, the transfer of lead elements in the soil-rice system of Chahayang, Fangzheng, Xiangshui, and Jiansanjiang rice fields can be significantly described, with R2 values ranging from 0.224 to 0.419; Both the pollution index and the comprehensive pollution index in the study area were less than 1, which belong to the non-pollution category. The health risk index of heavy metal lead for adults and children in all five regions is lower than the maximum acceptable risk level recommended by USEPA, and there is no risk of causing cancer. Province ICPMS. ICPMS ICP MS. MS ICP-MS leadelement element soilrice 002 0 02 0.0 mgkg mg kg 003 03 0017 017 0.01 0023 023 0024 024 Chinas China s 0.2 2 (0. mg/kg) value described R 0224 224 0.22 0.419 0419 419 1 nonpollution non category USEPA cancer 00 0. 001 01 (0 022 22 0.41 041 41 ( 0.4 04 4

Óxido de boro adsorvido sobre alumina (B2O3/Al2O3 ) foi usado como um novo e eficiente catalisador na síntese de β-aminocetonas e ésteres pela enaminação de diferentes aminas primárias e secundárias com compostos carbonílicos sob condições livre de solvente. A importância dessa metodologia congrega grande variedade de substratos, alta eficiência, ausência de catalisador metálico, alta régio- e quimioseletividade em condições amigáveis ao ambiente. Ainda, o catalisador pode ser recuperado facilmente depois das reações e reusado sem perda de atividade.

Boron oxide adsorbed on alumina (B2O3/Al2O3 ) has been found to be a new and highly efficient heterogeneous catalyst for the synthesis of β-enamino ketones and esters by the enamination of various primary and secondary amines with β-dicarbonyl compounds under solvent-free conditions. The important features of this methodology are broad substrate scope, high yield, no requirement of metal catalysts, high regio- and chemoselectivity and environmental friendliness. In addition, the catalyst could be recovered easily after the reactions and reused without evident loss of reactivity.