Research on high-yield culture technology of grain on flatland in hilly and gully region of Shaanbei

Using the best mixed plan，the experiment of 11 treatments show that the highest plot outputs of 1998，1999 and 2000 reach 12．92t／hm²．13．815t／hm² and 15．018t／hm²。respectively．343 plans are obtained through computer design，the best combination plan with yield of 15～17．625t／hm² is to use 60t／hm² of organic manure，462-483kg／hm² of N，to irrigate 600t／hm² of water before seeding，1377～1458t／hm²。of water in crop growth，to maintain the density of potato and sorghum with 72705～83415 plant／hm²。and 65205～75915 plant／hm² respectively．