A yield trial of 8 Karen type chilli varieties in 2 cultivated systems was studied under intercropping with corn and monocropping. Row spacing and tree spacing was 0.4 m x 0.8 m. for single-row. In paired-row used row and tree spacing was 0.4 m. x 0.6 m. From June 2011 to May 2012 at the Agricultural Technology Research Institute Lampang Province. Data of plant growth and yield were also collected. Results plant growth of the single-row intercropping gave average of plant height 57.2cm. Plant width of paired-row averaged 59.1 cm. Yield of the single-row of the ‘Khiri rat 4’ and ‘Khiri rat 7’ gave 0.37 and 0.36 ton per rai respectively. Paired–row of ‘Khiri rat 3’ and ‘Khiri rat 5’ were yielded 0.70 and 0.66 ton per rai. Monocropping of ‘Khiri rat 8’ gave 0.34 ton per rai of fresh yield. In addition yield was significantly different statistically among varieties Paried-row was the highest fresh yield of the systems.

The purpose of this research is to improve the pepper mill for increasing performance. The characteristic of the pepper mill is a trapezoid shape. The structure is made of angle steel and stainless steel sheet. The motor used a power unit is 1 hp and send the power to the driving belt for driving the disc. There are new pattern of designed discs. The discs are made from stainless steels and have three different patterns on the surface of discs. Each test must measures the moisture contented of the pepper seeds. If the moisture is less than 9% can be milled. However if the moisture is more than 9% that must be taken pepper seeds to sunning or drying. The test is 10 sets in each set of test using two samples of pepper seeds. In each test pepper seeds must be weighted before the milling when they are milled the finish. After that they are brought the milled pepper seeds to a weight and separated a size. The sorting by size is 5 sizes as a less than 5 microns 150-250 microns 250-425 microns 150 microns 425 to 1000 and more than 1.00 mm. The results of research shown that pattern of discs will give the different pepper powder sizes