Pengliang Tian , Jinxia Zhang , Lin Ding , Tao Zhong , Meng Yin , Runheng Yang , Liangliang Du , Yingru Xie
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引用次数: 0
Abstract
Pumpkin is an important cash crop in the northwestern arid region of China. Its yield is closely related to leaf growth and photosynthetic characteristics, which are nutritionally regulated by water-fertilizer coupling. Through a two year field experiment, the relationship between leaf growth, photosynthetic characteristics and yield under water-fertilizer coupling was analyzed. The results showed that leaf area index (LAI), soil and plant analyzer development value (SPAD), net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and yield all increased with increasing irrigation quota, and showed an increasing and then decreasing trend with increasing organic fertilizer application amount. Under F2W3 treatment (irrigation quota of 525 m3·ha−1 and total fertilization application of 5700kg·ha−1), LAI, SPAD, Pn, Tr, Gs and yield were all the highest. Water-fertilizer coupling had highly significant effects on yield, SPAD and Gs(P < 0.01), significant effects on LAI at maturity stage and Tr at flowering stage (P < 0.05). Based on structural equation modeling (SEM), it was shown that a reasonable water-fertilizer coupling could regulate LAI and SPAD of pumpkin leaves, and then improve their photosynthetic characteristics, and ultimately increase pumpkin yield. Gs (as the key index of photosynthetic characteristics) and SPAD (as that of leaf growth) were extracted separately for a comprehensive evaluation of Yield-SPAD-Gs. It was found that the range of optimal irrigation quota regulated by water-fertilizer coupling was 510.57 ∼ 526.9 m3·ha−1, and that of optimal organic fertilizer application was 5698.24 ∼ 6465.54 kg·ha−1. Therefore, F2W3 treatment was recommended as the optimal treatment for pumpkin cultivation in the region.
期刊介绍：
Scientia Horticulturae is an international journal publishing research related to horticultural crops. Articles in the journal deal with open or protected production of vegetables, fruits, edible fungi and ornamentals under temperate, subtropical and tropical conditions. Papers in related areas (biochemistry, micropropagation, soil science, plant breeding, plant physiology, phytopathology, etc.) are considered, if they contain information of direct significance to horticulture. Papers on the technical aspects of horticulture (engineering, crop processing, storage, transport etc.) are accepted for publication only if they relate directly to the living product. In the case of plantation crops, those yielding a product that may be used fresh (e.g. tropical vegetables, citrus, bananas, and other fruits) will be considered, while those papers describing the processing of the product (e.g. rubber, tobacco, and quinine) will not. The scope of the journal includes all horticultural crops but does not include speciality crops such as, medicinal crops or forestry crops, such as bamboo. Basic molecular studies without any direct application in horticulture will not be considered for this journal.
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