摘要：With the growing demand and working complexity of corn precision planter,it becomes more important to monitor the working performance through intelligent systems.A new fault monitoring system for corn precision planters was designed and *** system consisted of the information acquisition module,controller module,alarm module,input module and display module.A capacitive sensor was utilized to monitor the seed flow without changing the track of a precision *** system can monitor the whole sowing process of a seed-metering device in *** sowing status,fault type and fault location can be displayed on liquid crystal display(LCD).Warning light on the LCD reminds the operator of abnormal *** tests and field tests showed that the minimum monitoring accuracies of missing sowing and total sowing number were 92.11%and 94.28%,respectively,and the seed level sensor and the opener sensor worked *** system can accurately prompt the seed-metering mechanism in real-time.

摘要：The conflict and congruity of dualistic approaches to the world inundate the illustration of agricultural production in the Pre-Columbian Art of the *** production is co-dependent on human factors,environmental factors and animal *** symbiosis of these elements generated success or failure in harmony with the natural *** paper explores the relationship of three animals to successful crop production with particular attention placed on the cane toad,as this creature has often been confused with frogs or underplayed in earlier academic *** cane toad is a powerful force in organic farming,functioning as a deterrent to destructive *** addition,the cane toad produces powerful hallucinogenic substances for humans,while at the same time,repelling predators with its bitter taste,acrid smell and *** bufo-toxin is a powerful substance that links the toad with the Underworld origins of the maize.

摘要：To explore the control efficacy of 85%pyroxasulfone water-dispersible granule(WG)on annual weeds in corn field as well as its safety,a randomized block design was used to conduct a field plot test of efficacy at four different test *** sowing before seedling,85%pyroxasulfone WG at the doses of 10,15,20,and 40 g/667 m^(2),and 55%acetochlor+atrazine suspension concentrate(SC,control agent)at the dose of 170 g/667 m^(2)in summer corn area and 260 g/667 m^(2)in spring corn area were applied,*** test site without herbicide application was used as the blank *** results revealed that after 40 d of application,the control efficacy of 85%pyroxasulfone WG reached 83.75%~98.23%on Gramineae weeds,55.22%~98.33%on broadleaf weeds,and 88.03%~98.46%on Cyperaceae weeds,but without toxicity to *** with 55%acetochlor+atrazine SC,85%pyroxasulfone WG at the dose of more than 10 g/667 m^(2)had higher control efficacy on Gramineae weeds,lower efficacy on broadleaf weeds and similar efficacy on Cyperaceae *** sum up,spraying 85%pyroxasulfone WG at the dose of 15~20 g/667 m^(2)(an active component dose of 191.3~255.0 g/hm^(2))after sowing before seedling could effectively control some annual weeds in corn fields and had no toxicity to *** herbicide dose was greatly reduced,and thus 85%pyroxasulfone WG was recommended as an effective mean to control the main weeds in corn fields.

摘要：[Objective] To provide scientific guidance for corn production in Suijiang County of Yunnan Province, explore the best recommended fertilization of corn, and provide a scientific basis for formulating the formula fertilization of corn in Suijiang County. [Method] Through carrying out ＂3414＂ corn field fertilizer efficiency experiment in Suijiang County, with the help of ＂3414＂ field experiment design and data analysis management system＂ software, the ternary quadratic and one-variable quadratic fertilizer efficiency equations on corn yield were analyzed. [Result] The optimum fertilization scheme for corn in the region was as follows： when pure N, pure P2O5 and K2O were respectively 244.38, 58.75 and 107.38 kg/hm^2, the the obtained best yield of corn was 6 975.60 kg/hm^2, and the maximum benefit was 16 888.58RMB/hm^2. [Conclusion] The reasonable formula of N, P and K fertilizers can not only improve the yield of corn, but also increase economic benefit, having certain reference significance to the development of formula fertilization of corn in Suijiang County.

摘要：In order to investigate the most suitable sowing period and the optimum planting density of new com variety ‘Yudan 30＇ In Chongqing region, using split plot experiment design, the effect of sowing date and planting density on main a- gronomic characters and yield of maize in the field was studied. The results showed that in Chongqing, the delay of sowing date could shorten the fertility peri- od, and reduce 100-grain Weight and yield, but could increase plant height and ear height, panicle traits did not change significantly. With the density increasing, plant height and ear height also increased, while ear length, ear diameter, stem diameter, row number and kernel number also decreased. 100-grain weight and yield also in- creased with the increase of density, but to a certain threshold, yield and 100-grain weight decreased with the increase of density. The yield of 3 sowing periods pre- sented as AI〉A2〉A3, the yield of 4 kinds of density presented as B3〉EH〉B2〉B1, and the yield under sowing time and density interaction presented as AIB3〉A1B4〉 A2.B3〉A2.B4〉A3B3〉 A3B4〉A2.B2〉A1BI〉A2BI〉A3BI. So proper eady sowing and increase of planting density could raise the yield of maize per unit area, and AIB3 was the optimum planting configuration in Chongqing area.