Saponin synthesis and cotton growth is antagonistically regulated by solar UV-B radiation

Background: Earlier we have reported that the exclusion of solar UV-B increased the growth and yield of cotton plants as compared with ambient UV-B. The UV-B radiation effects on the saponins and the impact of ambient and reduced UV-B on the accumulation of saponins has not been investigated yet. Thus a field experiment was conducted to study the influence of solar UV-B on the growth response and saponin synthesis in cotton(Gossypium hirsutum) var. Vikram plants by the exclusion of UV-B. The cotton plants were grown in specially designed iron chambers, wrapped with filters that excluded UV-B(<315 nm), or transmitted ambient UV-B.Results: Exclusion of ambient UV-B enhanced the growth of cotton plants in terms of plant height and leaf area.Greater plant height in UV-B excluded plants was due to elongated internode and more number of nodes.Enhancement in growth was accompanied by a decrease in the accumulation of saponins, which was quantified by the spectrophotometric, TLC and HPLC methods. Solvent extraction of saponins from the internodes and leaves were used for the bioassay of Amaranthus hypocotyl growth and expansion of cucumber cotyledons. Extracts obtained from the UV-B excluded plants(leaves and internodes) promoted the growth to a larger extent as compared with the extracts obtained from ambient grown plants.Conclusions: The result indicates that solar UV-B may possibly suppress the plant growth by regulating the synthesis of natural growth inhibitor’s like saponin.

Recognition of cotton growth period for precise spraying based on convolution neural network

Dynamic acquisition of crop morphology is beneficial to real-time variable decision of precise spraying operations in fields.However,the existing spraying quantity regulation has high tolerance on the statistical characteristics of regional morphology,so expensive LiDAR and ultrasonic radar can’t make full use of their high accuracy,and can reduce decision speed because of too much detail of branches and leaves.Therefore,designing a novel recognition system embedded machine learning with low-cost monocular vision is more feasible,especially in China,where the agricultural implements are medium sizes and cost-sensitive.In addition,we found that the growth period of crops is an important reference index for guiding spraying.So,taking cotton as a case study,a cotton morphology acquisition by a single camera is established,and a cotton growth period recognition algorithm based on Convolution Neural Network(CNN)is proposed in this paper.Through the optimization process based on confusion matrix and recognition efficiency,an optimized CNN model structure is determined from 9 different model structures,and its reliability was verified by changing training sets and test sets many times based on the idea of kfold test.The accuracy,precision,recall,F1-score and recognition speed of this CNN model are 93.27%,95.39%,94.31%,94.76%and 71.46 ms per image,respectively.In addition,compared with the performance of VGG16 and AlexNet,the convolution neural network model proposed in this paper has better performance.Finally,in order to verify the reliability of the designed recognition system and the feasibility of the spray decision-making algorithm based on CNN,spraying deposition experiments were carried out with 3 different growthperiods of cotton.The experiments’results validate that after the optimal spray parameters were applied at different growth periods respectively,the average optimum index in 3 growth periods was 42.29%,which was increased up to 62.24%than the operations without distinguishing growth periods.

Effects of NaCl stress on the biochemical substances in Bt cotton as well as on the growth and development and adult oviposition selectivity of Helicoverpa armigera

Background:Recently,due to the development of food security strategies,cotton has been planted in inland saline-alkali dry soils or in coastal some saline-alkali soils in China.Under the condition,to comprehensively prevent and control Helicoverpa armigera in cotton fields with saline-alkali soils,it is important to study the larval growth and development of H.armigero and to study adult oviposition selectivity in H.armigera adults that feed on NaCI-stNaCled cotton plants.Results:In this study,Bt cotton GK19 was used for the experimental group and its nontransgenic parent Simian 3 was used for the control to study the effects of biochemical substances in cotton as well as larval growth and development and adult oviposition selectivity of H.armigera.The experiments were performed by growing cotton indoors under NaCl stress at concentrations of 0 mmol-L-1,75 mmol-L-1 and 150 mmol-L-1,respectively.The results showed that the expression of Bt protein was significantly inhibited for NaCI-stressed Bt cotNaClThe content of soluble protein and K+ in the leaves of cotton were decreased,while the content of gossypol and Na+were increased.In addition,the 5th instar H.armigera larvae exhibited shorten the life span in a 13-day trial period.Under enclosure treatments and at different female densities,the adult oviposition of H.armigera decreased on high NaCI-stressed nontransgenic coNaCl,while the oviposition on Bt cotton tended to first increase but then decrease under low,moderate and high NaCl stress treatments.Conclusions:Under certain content ranges of NaCl stress treatments,larval of H.armigera growth and development,and adult oviposition were no significant difference in the change for a certain period.However,under high NaCl stress,larval growth,development and adult oviposition were affected,which may provide insights for the prevention and control of H.armigero for Bt cotton in saline-alkali soils.

Growth, Physiological and Molecular Responses of Cotton (Gossypium arboreum L.) under NaCl Stress

Salinity is one of the most serious growth limiting factor, therefore, no longer being ignored. Although, cotton is fairly salt tolerant;its sensitivity at crop stand and yield is affected. This study is planned to identify the growth, physiological and molecular parameters in local cotton varieties FDH 171 and FDH 786 under NaCl stress. There was 100% seed germination but hypocotyl length was reduced at increasing level of NaCl. Plant height, fresh and dry biomass were reduced as the plants were subjected to increased stress of NaCl. Stomatal conductance, transpiration and photosynthetic rate and ionic imbalance were found to be reduced under the gradual increase in NaCl stress and affected the plant’s overall physiological processes. PCR product of AtNHX3 has been identified in stressed and non-stressed plants. Thus, the genotypes FDH 171 & FDH 786 were found tolerant to adoption of salt stress and could be used as a source in crop improvement.

噻苯隆复配植物生长延缓剂对棉花生长发育和产量的影响

为探究叶面喷施噻苯隆复配不同植物生长延缓剂对棉花生长发育和产量的调控效应,于2022年7—10月在新疆沙雅县海楼镇团结村进行大田试验,新陆中84号为供试棉花品种,以0.1%噻苯隆为主,分别复配缩节胺(W1)、调环酸钙(W2)、烯效唑(W3)、氟节胺(W4),以清水为CK,采用随机区组试验设计,在棉花化学打顶前后各喷施一次,分析其对棉花农艺性状、干物质积累与分配、叶面积指数、SPAD值和产量的影响。结果表明,各处理中W3处理各项调查指标总体最优。具体表现如下:吐絮期,W3处理棉花株高、株宽、第3果枝长、第7果枝长、叶枝长较CK分别降低1.23%、3.14%、10.96%、11.72%、18.92%;施药后30 d,SPAD值和蕾铃的干物质积累量较CK分别增加2.05%和9.98%,生殖器官干物质占比较CK提升7.61%,叶面积指数较CK提高10.85%;单株铃数较CK增加11.28%,籽棉产量较CK增加11.23%。综上,在化学打顶前后各喷施一次0.1%噻苯隆450 mL/hm^(2)+5%烯效唑75 g/hm^(2)能够抑制棉花无限生长,提高棉花叶面积指数和叶片SPAD值,促进棉株生殖生长,提高单株铃数,从而显著提高棉花产量。

Evaluation of Impact of Pollen Grains from Bt,Bt/CpTITransgenic Cotton and Bt Corn Plants on the Growth andDevelopment of the Mulberry Silkworm,Bombyx moriLinnaeus (Lepidoptera:Bombycidae)

The S-endotoxin genes of Bacillus thuringiensis (Bt) and proteinase inhibitor (PI) genes are two kinds of genes popularly used for developing transgenic plants resistant to insect pests. To clarify whether there is any risk concerning the effects of pollens from these transgenic crops on non-target insects with economic importance, such as the effects on the growth and development as well as cocoon quality of the silkworm, Bombyx mori Linnaeus, a series of feeding experiments were conducted, using pollens from transgenic cotton or corn containing cry 1Ac, cry1A+CpTI or crylAb genes, compared with pollens from non-transgenic normal cotton and corn as well as the non-pollen treatment. In contrast to the latter ones, pollens from transgenic plants showed no significant adverse effects on larval mortality, cocoon weight, pupa weight, cocoon shell weight, pupation rate, emergence rate and fecundity of the silkworm after neonates were fed with the pollens for 72 h. In addition, no dosage effects of pollens were found. Though the duration of 1st instar larvae was prolonged in the case of feeding with transgenic pollens as compared with those of the non-pollen treatment , but they were not significantly different from those fed with pollens from non-transgenic cotton or corn. Meanwhile, the body weight of the 3rd instar molters fed with transgenic pollens was obviously different from those for non-pollen treatment, and was all significantly heavier than that of the controls. Consequently, it is considered that the adverse effect of pollens from transgenic insect-resistant cotton and corn on the growth and development of the silkworm is negligible.

三种植物生长调节剂对棉花种子萌发和幼苗生长的影响

为研究植物生长调节剂浸种对棉花种子萌发和幼苗生长的影响,观察不同植物生长调节剂对棉花种子萌发的调节作用,以新陆早57号为试验材料,清水浸种为对照,用冠菌素、缩节胺、芸苔素等3种植物生长调节剂进行浸种,采用砂培法进行种子萌发试验,测定各处理萌发特征、农艺性状和光合特征等指标,并评价植物生长调节剂生物学活性。结果表明,0.01μmol/L冠菌素处理可提高棉花发芽率、发芽势、幼苗净光合速率,与ck比较分别提高17.91%、12.79%、10.23%;10μg/L芸苔素可提高棉花发芽率、活力指数,较ck分别增加10.84%和19.58%;150 mg/L缩节胺处理提高棉花光合速率和子叶SPAD值,较ck分别提高15.06%和15.33%。主成分分析显示,0.01μmol/L冠菌素处理效果最好,10μg/L芸苔素处理次之。综上,冠菌素、缩节胺、芸苔素三种植物生长调节剂对棉花生长发育均具有不同程度的调控作用,其中0.01μmol/L冠菌素处理促进棉花种子萌发以及幼苗生长效果最好,10μg/L芸苔素处理次之。

南疆阿拉尔垦区密植棉花株高模拟研究

【目的】探讨新疆阿拉尔垦区密植条件下不同模型对棉花株高的预测效果。【方法】以株型差异较大的新陆中81号和塔河2号为试验材料,在阿拉尔垦区16000株·hm^(-2)密植条件下开展大田试验,用Python语言建立株高生长的逻辑斯谛(logistic)、冈珀茨(Gompertz)、理查德(Richards)方程和决策树机器学习预测模型,并对模型的预测精度进行分析。【结果】Logistic、Gompertz和Richards模型中,新陆中81号株高的均方根误差(root mean square error,RMSE)分别为8.38%、7.49%和7.52%,平均绝对误差(mean absolute error,MAE)分别为6.80%、5.79%和5.82%;塔河2号株高的RMSE分别为6.09%、4.77%和4.85%,MAE分别为4.52%、3.34%和3.36%。决策树机器学习方法中,新陆中81号与塔河2号株高的RMSE分别为6.91%和3.27%,MAE分别为5.04%和2.16%。Logistic、Gompertz和Richards生长方程以及决策树机器学习方法均能较好地预测密植条件下棉花株高的生长,但在预测精度上决策树机器学习方法总体上优于生长方程。【结论】基于决策树的机器学习方法不需要用数理统计知识解释模型,训练模型需要的数据量也较少,模拟精度更高,在模拟棉花株高方面有一定优势,是对传统生长方程的有益补充。

重金属镉胁迫下棉花纤维品质和棉籽油质量的变化及评价

为探究Cd污染对棉花纤维品质和棉籽油质量的影响,明晰棉花产物质量变化规律,本试验以棉花品种中棉所65为材料,设置6个土壤有效Cd含量[0.97 mg·kg^(-1)(Cd1)、11.21 mg·kg^(-1)(Cd11)、14.26 mg·kg^(-1)(Cd14)、23.30 mg·kg^(-1)(Cd23)、49.36 mg·kg^(-1)(Cd49)和77.11 mg·kg^(-1)(Cd77)],测定不同含量Cd胁迫下棉花叶片SPAD值、净光合速率、各个器官的Cd含量、部分农艺性状、纤维品质及棉籽油质量,评价棉花纤维和棉籽油中Cd含量。试验结果显示:Cd胁迫对棉花株高影响差异显著。Cd11处理棉花总生物量较Cd1处理显著增加,而Cd23处理棉花总生物量显著下降。棉花富集Cd的主要器官为叶柄、茎和根,且不同含量土壤Cd污染环境下棉花不同器官对Cd的富集能力存在差异。随着Cd含量的增加,棉花纤维上半部平均长度、整齐度指数、纤维伸长率和纺纱均匀性指数显著降低,而断裂比强度和马克隆值变化不显著。在Cd49和Cd77处理条件下,棉花纤维中Cd含量超过GB/T 18885—2020规定的总Cd含量,棉花纤维使用存在风险。棉籽油中未检测到Cd,Cd胁迫对棉籽油的过氧化值影响不显著。随着Cd离子含量增加,棉籽出油率先上升后下降,棉籽油的酸价增加,导致棉籽油质量下降。研究表明,棉花具有优异的Cd耐受性及Cd累积能力,Cd胁迫显著降低了棉花纤维上半部分平均长度、整齐度指数、纤维伸长率和纺纱均匀性指数,降低了棉籽油出油率,增加了棉籽油酸价。

不同矿化度水源膜下滴灌对棉花土壤盐分分布及生长的影响

利用微咸水膜下灌溉是缓解干旱区农业灌溉资源短缺的有效途径之一,分析不同矿化度水源膜下滴灌对土壤盐分分布及作物生长的影响对于确定灌溉水源矿化度阈值具有重要意义。开展4 a不同梯度矿化度水源膜下滴灌棉花测坑试验,设置6个处理矿化度分别为1 g/L(CK)、2 g/L(A)、3 g/L(B)、4 g/L(C)、5 g/L(D)和6 g/L(E),分析不同梯度矿化度水源膜下滴灌土壤盐分累积及棉花生长特征,确定微咸水膜下滴灌棉花灌溉矿化度阈值。结果表明:2019-2022年,0~100 cm平均土壤电导率以每年0.920 dS/m、0.995 dS/m、1.196 dS/m和1.188 dS/m的速率呈线性增长的趋势。随着灌溉年限增加,不同梯度微咸水膜下滴灌下土壤电导率呈现增加趋势。5 g/L和6 g/L处理土壤盐分累积最大,分别为38.70%和39.19%;灌水12 h后,宽行表层20~40 cm土壤盐分累积最为明显,土壤电导率为0.30~2.1 dS/m;窄行土壤盐分在40~60 cm土层处出现累积,土壤电导率为1.26~1.93 dS/m。矿化度为3 g/L水源膜下滴灌棉花土壤盐分累积量较小,对棉花叶片光合作用指数影响最小,生长指标和产量达到最大,微咸水膜下滴灌棉花适宜的灌溉水源阈值为3 g/L。

不同种植模式和品种对棉花光合物质生产及产量的影响

【目的】研究不同种植模式与品种对棉花光合物质生产及产量的影响。【方法】试验于2022年在新疆阿克苏地区沙雅县海楼镇进行,选择2种不同株型结构的棉花品种源棉11号、新陆中80号、新陆中84号和J206-5,选用2种种植模式:76 cm等行距(1膜3行)和(66+10)cm宽窄行(1膜6行),设置田间试验分析不同种植模式及品种对棉花生育进程、植株形态、叶面积指数、净光合速率、干物质积累和产量的影响。【结果】不同棉花品种在1膜3行处理下较1膜6行处理生育期缩短4~6 d,株高、始果枝高度、果枝夹角和平均果枝长度受种植模式影响较大。盛铃前期之前,不同株型棉花品种在1膜3行处理下的叶面积指数较高。但随着生育期推移,株型松散型的源棉11号、J206-5和株型紧凑的新陆中80号、新陆中84号分别在1膜3行处理、1膜6行处理下叶面积指数下降幅度较小,在棉花生育后期能维持较高的叶面积指数。盛花期前,不同株型棉花品种的净光合速率均表现为1膜3行处理高于1膜6行处理,但在盛花期至吐絮阶段,株型松散型的源棉11号、J206-5和株型紧凑的新陆中80号、新陆中84号净光合速率分别在1膜3行处理、1膜6行处理下达到最大值且下降缓慢,延长了光合作用持续时间,有利于棉花后期产量形成。株型松散型的源棉11号、J206-5在1膜3行处理下较1膜6行处理皮棉产量增加15.45%~17.23%,株型紧凑的新陆中80号、新陆中84号在1膜6行处理下皮棉产量较1膜3行处理增产9.23%~12.00%。【结论】不同株型棉花品种应选择适宜的种植模式,才能进一步发挥其增产潜力。株型松散的棉花品种适宜在76 cm等行距下种植,株型紧凑的棉花品种适宜在(66+10)cm模式下种植。

应用Cotton2k模型模拟北疆棉花生长结果的分析

Cotton2k模拟模型是一个动态模型,能在生理过程水平上模拟棉花的生长发育和产量形成.通过应用棉花生产管理系统（GOSSYM/COMAY）中一种机理性很强的棉花生长模拟模型Cotton2k,对新疆北部地区棉花的生长状况进行模拟.从生育期的模拟结果分析得出除60%吐絮期误差较大外,其他生育期的模拟结果非常好;从形态发育模拟和实测结果比较表明：形态发育在花铃期前基本吻合;各器官干物质重的模拟和实测结果比较表明：除叶重误差较大外,其他的模拟结果较为满意,特别是植株干重的模拟可以作为精准农业水肥诊断的依据;植株中氮浓度的模拟误差较大,其原因分析有二：（1）棉花在生长发育过程中本身的生物学特性决定了每个生育期对不同肥的吸收量值不同,导致模拟值与观测值有差异;（2）在播种前应对试验地的肥力进行测定,使原始含N量的差异排除,会对模拟结果的精度有所提高.各层土壤含水量的模拟结果表明：耕作层0～45的土壤水分含量差异较大,但是45 cm以下土层的土壤含水量模拟结果与实测值基本吻合;不同水肥处理方式下的产量模拟结果和实测结果比较,产量模拟的误差较大.

COTTON2K在新疆棉花精准种植管理中的应用

简述了棉花模拟模型COTTON2K的新增特点,并利用新疆2002～2003年棉花数据对该模型进行校正和验证,指出模型验证中存在的问题.

棉花黄萎病生防菌筛选鉴定及根瘤菌DG3-1对棉花生长的影响

本研究旨在发掘南疆棉花内生菌种质资源来防治棉花黄萎病,探究根瘤菌对棉花生长的影响。采用常规组织分离法分离棉花不同组织内生细菌;平板对峙法筛选拮抗棉花黄萎病菌的内生菌,并对其进行分子鉴定;通过盆栽试验研究根瘤菌对棉花生长的影响。结果显示,棉花不同组织内生细菌的数量具有一定差异,根部最多,其次是叶和茎;在分离获得的31株内生菌中,有11株对棉花黄萎病菌具有拮抗活性,抑菌率在35.99%~68.28%之间,经鉴定,9株为芽孢杆菌,2株为根瘤菌,其中,根瘤菌DG3-1对棉花黄萎病菌的抑制率为(56.63±1.82)%;盆栽试验结果表明,菌株DG3-1处理后棉株的地上鲜重、地上干重、地下鲜重、地下干重、叶绿素含量分别比对照增加2.12、2.09、1.05、0.75、1.75倍。菌株DG3-1对棉花黄萎病菌有较好的抑制作用,并且对棉花的生长有一定的促生作用,是防治棉花黄萎病的潜力菌株,可为微生物菌剂的研发提供菌种资源。

无人机喷施不同浓度缩节胺对棉花生长发育的影响

【目的】研究无人机喷施不同浓度缩节胺对棉花生长发育的调控效应,为构建棉花轻简栽培提供科学依据。【方法】在缩节胺剂量相同的条件下,共设置6个不同兑水量控制缩节胺浓度(缩节胺分次分时期喷施,共7次),分别为7.5(C_(1))、15(C_(2))、22.5(C_(3))、30(C_(4))、37.5(C_(5))、45(C_(6))L/hm^(2),分析不同缩节胺浓度对棉花生长发育的影响。【结果】喷施低浓度缩节胺(C_(5)、C_(6))会延长棉花生育期,使棉花贪青晚熟;中浓度缩节胺(C_(3)、C_(4))处理的棉花株高较低,对棉花株高抑制效果最好,其中C_(4)处理产量最高;高浓度缩节胺(C_(1)、C_(2))处理会使棉花生育时期提前,缩短生育期,促早熟,但不利于伏前桃增长,还会降低棉花单铃重。【结论】新疆南疆地区种植棉花使用无人机化控时,选择兑水量为30 L/hm^(2)(C_(4))的调控效果最优,且皮棉产量达到2762.6 kg/hm^(2)。

不同生育时期去叶对棉花生长发育及产量的影响

为探明冰雹损伤叶片对棉花生长及结铃的影响,本研究开展主区为不同生育时期(孕蕾期、盛蕾期和花铃期)、副区为不同人工去叶强度(去叶0、25%、50%、75%和100%)的两因素裂区田间试验,研究模拟雹灾叶损对棉花农艺性状、干物质积累及产量构成的影响。结果表明,损伤叶片会影响棉花株高、果枝数及生物量,最终影响棉花产量。随着去叶时期后移及强度的增加,棉花株高呈下降趋势,D_(4)处理(去叶100%)各时期平均株高较CK(不去叶)、D_(1)(去叶25%)、D_(2)(去叶50%)、D_(3)(去叶75%)分别降低19.80%、13.67%、14.19%、8.00%,D_(1)、D_(2)、D_(3)、D_(4)平均果枝数较CK分别降低14.61%、25.29%、30.65%、46.66%。去叶对果枝数的影响高于对株高的影响。不同时期去叶对“库”的影响大小为花铃期>盛蕾期>孕蕾期,且去叶强度越大,对“库”的影响越大。盛蕾期去叶50%处理的蕾花铃干物质量、单株结铃数、产量分别较CK增加12.46%、14.99%、6.39%,产生了超补偿现象。综上可知,棉花叶片受损后,根据实际情况进行补救,也可获得相应产量,减少经济损失。该结论可为雹灾棉田栽培管理提供理论依据和数据支持。

Comparison of the Activity Differences in Two Terminal Oxidases between Upland Cotton and Sea-island Cotton

[Objective] This study was to reveal the differences in two terminal oxdiases,so as to provide theoretical basis for the selection of upland and sea-land hybrid materials. [Methods] Using 7 shares of upland cotton cultivars and 4 shares of sea-land cultivars as experimental materials,the change differences in AAO and PPO activities during whole growth period of the materials tested were studied. [Results] Two terminal oxdiases both in upland and sea-land cotton cultivars assumed similar change laws during whole growth period. AAO activity assumed a low-high trend,and there is a peak at the early stage. PPO activity presented two peaks,and that at the early stage was higher than at the late stage; the first peak is obviously higher than the second for sea-land cultivars,and two peaks are not remarkably different for upland cultivars. [Conclusion] The differences in AAO and PPO activities of sea-land and upland cotton cultivars observed on Jul.4th and Aug.6th,may provide guidance for the selection of upland and sea-land hybrids.

Promoting the production of salinized cotton field by optimizing water and nitrogen use efficiency under drip irrigation

Cotton is the main economically important crop in Xinjiang,China,but soil salinization and shortage of water and nutrients have restricted its production.A field experiment was carried out in the salinity-affected arid area of Northwest China from 2018 to 2019 to explore the effects of nitrogen and water regulation on physiological growth,yield,water and nitrogen use efficiencies,and economic benefit of cotton.The salinity levels were 7.7(SL)and 12.5 dS/m(SM).Drip irrigation was used with low,medium and adequate irrigation levels representing 60%,80%and 100%of cotton crop water demand,respectively,and three nitrogen applications,i.e.,206,275 and 343 kg/hm^(2),accounting for 75%,100%and 125%of local N application,respectively were used.The multi-objective optimization based on spatial analysis showed that,at SL salinity,water use efficiency(WUE),nitrogen use efficiency(NUE),economic benefit and yield simultaneously reached more than 85%of their maxima at 379.18-398.32 mm irrigation and 256.69-308.87 kg/hm^(2).At SM salinity,WUE,yield and economic benefit simultaneously reached more than 85%of their maxima when irrigation was 351.24-376.30 mm and nitrogen application was 230.18-289.89 kg/hm^(2).NUE,yield and economic benefit simultaneously reached their maxima at 428.01-337.72 mm irrigation,and nitrogen application range was 222.14-293.93 kg/hm^(2).The plants at SL salinity had 21.58%-46.59%higher WUE rates,14.91%-34.35%higher NUE rates and 20.71%-35.34%higher yields than those at SM salinity.The results are of great importance for the nutrient and water management in cotton field in the arid saline area.

结合变异系数法和机器学习模型的棉花长势监测

为了更加准确地获取棉花关键物候期的长势信息,本文首先通过棉花制图指数提取棉花种植区域;然后利用变异系数法将反映棉花长势的株高、SPAD值、叶片湿重、叶片干重与叶面积5种指标构建为一个综合长势指标,即棉花长势指数(FBCGI);最后选取最优特征变量,结合随机森林模型构建棉花长势反演模型。结果表明:①棉花总体分类精度达到81.65%;②与5种单一长势指标相比,构建的FBCGI与植被指数的相关性更高;③基于最优特征变量和随机森林模型构建的棉花长势监测模型,在建模集和验证集中的R 2和RMSE分别为0.74、0.07和0.51、0.10。研究结果可为棉花长势监测提供重要参考。

基于高光谱遥感技术的棉花长势监测研究进展

高光谱遥感技术的快速发展使得作物长势监测方法更加简单、便捷、准确,同时还可获得大范围的作物信息,这为实现棉花生长状态的快速、连续监测提供了重要技术支撑。综述高光谱遥感技术在棉花长势监测方面的研究进展,并对高光谱遥感技术在棉花长势监测方面的未来发展进行展望。