基于冠层红绿蓝光值评估氮肥施用下小白菜的产量变化  

Evaluation of Chinese Cabbage Yield under Nitrogen Fertilizer Application Based on Canopy Red,Green and Blue Values

作　　者：柳开楼[1] 熊文[1] 李涵 胡惠文[1] 陈伟明[1] 章彪雄[1] LIU Kailou;XIONG Wen;LI Han;HU Huiwen;CHEN Weiming;ZHANG Biaoxiong(Jiangxi Institute of Red Soil,Nanchang 331717,China;Jiangxi Fisheries Research Institute,Nanchang 330046,China)

机构地区：[1]江西省红壤研究所,江西南昌331717 [2]江西省水产科学研究所,江西南昌330046

出　　处：《蔬菜》2018年第12期21-25,共5页Vegetables

基　　金：江西省科技特派团项目;江西省自然科学基金(20151BAB214008);江西省科技计划项目(20141BBF60050)

摘　　要：为指导菜农调整施肥等管理措施,缓解蔬菜种植日益严峻的竞争压力,通过设置不同氮肥处理的田间小区试验,采用智能手机在小白菜播种后第20天(D20)、第30天(D30)、第40天(D40)、第50天(D50)获取群体冠层数字图像,同时监测小白菜产量(鲜质量)。结果表明:不同采收时间内各处理的产量(鲜质量)变化基本一致,均表现出施用氮肥处理显著高于不施氮肥处理,施氮可以使小白菜产量(鲜质量)增加27.82%～52.85%,其中以667 m2施用17.5 kg时产量(鲜质量)最高。蔬菜冠层数字图像中红光值R、绿光值G与产量(鲜质量)的关系可以用二次曲线进行拟合,方程分别为y=-0.092 6x^2+23.365x-242.53(R2=0.581 8),y=-0.044x^2+15.843x+50.495(R^2=0.724 9);但蓝光值B与小白菜产量(鲜质量)不存在显著关系。验证试验进一步表明,用冠层的红光值R和绿光值G能够较好地预测小白菜产量(鲜质量)。In order to guide the fertilization management for vegetable farmers and relieve the increasingly severe competition pressure of vegetable planting, experiment was conducted which included different nitrogen fertilizer amount, and then, the digital image of the population canopy was obtained on the 20th (D20), 30th (D30), 40th (D40) and 50th (D50) days after sowing of Chinese cabbage through smart phone. Meanwhile, the fresh yields of the cabbage were measured. The results showed that the fresh yield changes of different treatments during different times were all showed that the N17.5 and N20 were significantly higher than that of no nitrogen fertilizer (N0) treatment. The fresh yield of N17.5 was increased by 27.82% ~52.85% than N0. The relationship between canopy red light (R), green light (G), and fresh yield of vegetable could be fitted with a quadratic curve. The equations were y =-0.092 6x^2+23.365x-242.53(R^2=0.5818),y =-0.044x^2+15.843x +50.495(R^2=0.7249). However,there was no significant relationship between blue light (B)value and fresh yield.Furthermore,the verification experiment indicated that the canopy R and G values could better predict the Chinese cabbage fresh yield.

关 键 词：小白菜 氮肥用量 产量 冠层 

分 类 号：S634.3[农业科学—蔬菜学]