Estimation of Winter Wheat Tiller Number Based on Optimization of Gradient Vegetation Characteristics

Fei Wu,Xiaoxin Song,Junchan Wang,Chengming Sun,Tao Liu,Yuzhuang Zhou,Chengxin Ju

doi:10.3390/rs14061338

Fei Wu, Xiaoxin Song + Show 5 more

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https://doi.org/10.3390/rs14061338

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Abstract

Tiller are an important biological characteristic of wheat, a primary food crop. Accurate estimation of tiller number can help monitor wheat growth and is important in forecasting wheat yield. However, because of leaf cover and other factors, it is difficult to estimate tiller number and the accuracy of estimates based on vegetation indices is low. In this study, a gradual change feature was introduced to optimize traditional prediction models of wheat tiller number. Accuracy improved in optimized models, and model R2 values for three varieties of winter wheat were 0.7044, 0.7060, and 0.7357. The optimized models improved predictions of tiller number in whole wheat fields. Thus, compared with the traditional linear model, the addition of a gradual change feature greatly improved the accuracy of model predictions of wheat tiller number.

Highlights

Wheat is widely cultivated on a global scale as a major food crop [1], providing the main source of calories for humans [2]
Regression and in all varieties, tiller number increased with increasing coverage, mean normalized differential vegetation index (NDVI), and Coverage and mean values
Sistent, and inwas all varieties, tiller number increased with increasing coverage, mean NDVI, The three agronomic parameters did not adequately wheatthe tiller number,ofbased and mean RVI

Summary

Introduction

Wheat is widely cultivated on a global scale as a major food crop [1], providing the main source of calories for humans [2]. Similar to most gramineous plants, wheat produces tillers, which develop from axillary buds on the mother bud [3]. The emergence, development, and survival of tillers are very important biological characteristics of wheat [4]. Wheat is highly adaptable to different environments and can self-regulate population size. Tillering can have positive or negative effects on wheat yield, but reasonable tillering is positively associated with wheat yield [5]. Tillering of wheat is affected by external factors, and the proper application of nitrogen (N) fertilizer can significantly affect tillering and promote tillering yield [6]. The number of tillers increases with an increase in planting density [7]. The suitable application of phosphorus fertilizer promotes wheat tillering

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