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Corn is the country's second-largest food crop in the country plays an important role in national economic development. In our high-yield less than one-third of the total area of ??China's corn production levels in general terms, in the low-yielding fields of corn production is more important. Hebei Heilonggang watershed landowner typical low-yielding maize producing areas, in order to explore and build for the region's maize cultivation technology system, in the \from 2006 to 2007 in Wuyi County, Hebei Province, to carry out pilot state-Breeding Farm. This test uses field experiments and laboratory physiological measurement combining technical route, from the variety, cultivation methods, density, chemical control and fertilization five aspects of maize cultivation techniques of systematic study. The main results are as follows: 1. Through 50 different maize varieties comparison test, which filter out the growth period in the late 98 ~ 105d yield potential is large, compact plant or semi-compact, medium dwarf (height 186 ~ 250cm ), single grain number 450 or more, weight 290 grams or more, suitable for close planting medium large spike, strong resistance varieties DH3719, Yuyu 34, Jishi Yu One, as Heilonggang watershed Zhengdan958 mix varieties. 2 dense type dwarf varieties resistant DH3719, high pole varieties Zhengdan958 and sparse large panicle of single 808 in high yield under 60000,75000,90000 fertilization and 105000. Hm -2 < / sup> 4 density data gradient cultivation experiment. The results show that, DH3719 to 105,000. Hm -2 , Zheng 958 and 808 to 75,000 in a single. Hm -2 most appropriate, and confirmed to achieve ultra-high-yield corn density of 75,000 ~ 105,000. hm -2 is appropriate. 3 Set other spacing (50cm), Size line (80 × 40cm), two varieties of flowers planted (similar growth period, plant height difference is big) and Dibble (one point four) four kinds of planting process, test results show that the size of OK, floral planting and mulching treatment such as more traditional 50cm spacing planting can improve energy efficiency and increase dry matter accumulation, conducive to play maize heterosis, coordination of individual and group relations; ear length, bald short, ear diameter, empty stalk is low, the number of multi-grain, an increase of 5.5 to 18.9%. But Dibble planting water consumption is not conducive to mechanized operations; size of rows and flower planting can be cultivated as an ideal way. 4 varieties resistant to dense compact and Jing Shan Zheng 958 28 82 500. Hm -2 density, the size of the line to take planting by soaking before sowing and maize jointing stage (8 expanded leaves) spraying regulator B dwarf mixture, the base of its stem between 1 to 6 was significantly shorter in length, plant height and ear height decreases in the lower part of the leaf area reduction, improved plant type, thereby improving energy utilization . Physiological functions of the various organs of the plant while varying degrees of regulation, ear traits significantly improved, empty bar rate reduction, grain number and grain weight increased, production increased 20.7 ~ 32.6%. 5 to headed varieties Zhengdan958 in 75000. Hm -2 density conditions, the \good fertilization. Low-yielding fields per hectare N250 ~ 300kg, P2O565kg, K2O75 ~ 100kg (N: P: K = 1:0.22 ~ 0.26:0.33), production of up to 7200kg per hectare or more, yielding Tian Xiayu meters per hectare N270kg, P2O5130kg, K2O160 kg (N: P: K = 1:0.49:0.60), per hectare yield up to 7800kg or more. From the best value for money and the best fertilizer ratio of output to input angle is greater than in the low-yielding fields yield potential high-yield field; different fertilizers on maize yield increased degree of influence: the nitrogen gt; potash gt; phosphate; corn yield field NPK best ratio of 1:0.49:0.6. In summary, Heilonggang watershed maize cultivation techniques mode: use Zhengdan 958, DH3719, Yuyu 34 other dense-resistant varieties; using size rows or flower planting, 75,000 ~ 105,000. Hm -2 < / sup> of planting density; jointing spraying chemical regulators; fertilization for soil fertility, low-yield farmland per hectare N250 ~ 300kg, P2O565kg, K2O75 ~ 100kg, high-yield per hectare N270kg, P2O5130kg, K2O160kg, fertilizer Zinc 22.5 kg; staging fertilization, P, K fertilizer full basal application, N fertilizer seedling 30%, 70% of large mouth; strengthen field management of pests, timely harvest, can significantly improve the yield of corn.
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