Nutritional requirements and precise fertilization of wine grapes in the eastern foothills of Helan Mountain

Abstract

Cabernet Sauvignon grapes in the wine-producing area of Helan Mountain, East Ningxia, China, were the research object in this study. The dissection of the roots and branching stems method was used to explore the dynamic changes in the nitrogen, phosphorus, and potassium nutrient requirements of wine grapes over a number of growth stages. The results showed that over the whole growth period, the nitrogen content of the roots was the highest during the leaf-expansion stage and lowest during the turning-color stage, and that the nitrogen content of the leaves and fruit showed a downward trend as growth progressed. The nitrogen content of the secondary branches was the lowest during the fruit expansion stage and the highest during the leaf-expansion stage; and the phosphorus content of the roots was the highest during the leaf-expansion stage and lowest during the fruit expansion stage. The phosphorus content of the trunk and primary branches showed a trend of "rising-falling-rising". The phosphorus content of the leaves and secondary branches was the lowest during the turning-color stage, whereas the phosphorus content of the fruit was at its highest during this stage. The potassium contents of the secondary branches and fruit showed a downward trend, but the potassium content of the leaves was highest during the fruit expansion stage and lowest in the nutrient return stage. Over the whole growth period, the accumulation of nitrogen, phosphorus, and potassium in wine grapes was 129.92 kg/hm 2 , 41.51 kg/hm 2 , and 189.47 kg/hm 2 , respectively, the total requirements for N, P 2 O 5 , and K 2 O were 262.38 kg/hm 2 , 288.15 kg/hm 2 , and 569.04 kg/hm 2 , respectively, and the reasonable nutrient requirement ratio was 1.00:1.10:2.17.

Research Progress in Intelligent Diagnosis Key Technology for Orchard Nutrients

“…Changes in lighting conditions have a significant impact on nutrient prediction results, which has been validated by experimental results. It had high accuracy in leaf detection [3,4], but low accuracy in canopy detection [1,2]. Preprocessing algorithms were mainly aimed at removing the background and correcting colors, without addressing color differences caused by lighting changes.…”

“…Jiang et al studied the dynamic changes in the N, P, and K requirements of wine grapes over different growth stages using the dissection of roots and the branching stems method. The optimal nutrient levels of the trees at different stages were obtained [3]. Sun et al used the diagnosis-and recommendation-integrated system to obtain the best nitrogen status of apple leaf [9].…”

“…Nutrient diagnosis is the basis for precise fertilization prescriptions. On the one hand, it should be based on the current status of tree nutrients and soil nutrients [1,2], and on the other hand, it should be based on the appropriate nutrient standards for different varieties, tree ages, and growth periods [3]. Through comparison, it can be used to diagnose nutrient richness and deficiency.…”

Multivariate Analysis and Optimization of the Relationship between Soil Nutrients and Berry Quality of Vitis vinifera cv. Cabernet Franc Vineyards in the Eastern Foothills of the Helan Mountains, China

“…Regardless of the intrinsic relationship between soil nutrients, they are bound to have an impact on grapevine and grape quality. Many previous studies have shown that different vineyard soil nutrients are different [7,8], and that different soil nutrients have different effects on grape plant growth and grape quality [9][10][11].…”