Several Biological Effects Of Root Fertilizing With Urea, Calcium Superphosphate And Potassium Sulphate Fertilizer On Juglans Regia ’Xinwenl85’ During Full Fruit Period

Juglans regia ‘Xinwen185’ is the main cultivar in J. regia major producing area of theSouth Xinjiang Basin. However, due to lacking for a scientific fertilization parameter anddepth understanding of photosynthesis, yield and quality effects of N, P and K rootapplication, it has become the main limiting factor for achieving quality and efficiency of J.regia ‘Xinwen185’ production garden by fertilizing and soil nutrient management in full fruitperiod. Therefore, J. regia ‘Xinwen185’ during full fruit period, Wushi, Xinjiang was taken asthe research object. With the methods of field trials and lab analyses, net photosynthetic rate(Pn), maximum conversion efficiency of light energy (Fv/Fm), yield and quality effects ofnuts, and the effect relationships were studied under specific soil nutrient conditions. Basedon the effect relationships, fertilizer application amount parameter of N, P, and K underspecific soil nutrient conditions were drawn up through synthetic decision. The main resultswere as follows:The effect relationships of Pn (M) in N, P and K root fertilizing were explained in thefollowing subsection. Fruit fast-growing period: log10M＝0.7369+0.1602N－0.0941N2＋0.4044P×K. Fruit hardcore period: log10M＝0.6578＋0.2632N＋0.0014P－0.0864N2. Fruitfat changes period: log10M＝0.7532＋0.2800N＋0.0712P－0.1060N2－0.0702P2. Fruitmature period: log10M＝0.9267＋0.2171N＋0.0293P－0.0796N2－0.0211P2.The effect relationships of Fv/Fm (F) with N, P and K root fertilizing were explained inthe following subsection. Fruit fast-growing period: log10F＝－0.1661＋0.0605N－0.0373N2＋0.0247P. Fruit hardcore period: logF210＝－0.1145＋0.0253N－0.0118N. Fruitfat changes period: log10F＝－0.1251＋0.0230N－0.0101N2＋0.1965K－0.6191K2. Fruitmature period: log10F＝－0.1103＋0.0408N－0.0184N2＋0.0318K.The effect relationship among yield of single nut (G，kg), N, P and K root fertilizing waslog10G＝0.8646＋0.2100N－0.0718N2＋0.4170K.The quality effect relationships of nuts with N, P and K root fertilizing were explained inthe following subsection. Single weight of nut (W，g): log10W＝0.9289＋0.1616N－0.0616N2＋0.1570K. Rate of nut kernel (Y，g/g): arcsinY＝0.5634＋0.2455N－0.1004N2.Crude fat content of nut (E，g/g): arcsin E＝0.5407＋1.1412K－2.8887K2＋0.2759P－0.2850P2. Crude protein content of nut (C，g/g): log10C＝0.3727＋0.3974N－0.1632N2＋0.5664P×K.The fertilizer application amount (scalar amount) parameter of N, P and K root fertilizingwere explained in the following subsection. N was1.2393kg per plant; P was0.6943kg perplant; And K was0.2978kg per plant.