Effects of Drip Irrigation Amount on the Growth of Walnut Seedlings

doi:10.11924/j.issn.1000-6850.casb2021-0597

Abstract

Abstract:

The paper aims to determine water and fertilizer requirements of walnut growth as well as appropriate water and fertilizer management measures. The 1-year-old walnut seedlings were used as experimental materials, and 5 different irrigation gradients were set up under 60% fertilization amount, and drip irrigation was conducted 1 time every 10 days. Treatment TG1 was 1000 mL/time irrigation, and the other drip irrigation treatments were 85% (TG2), 70% (TG3), 55% (TG4), and 40% (TG5) of TG1. The results showed that under the drip fertilization method with 60% fertilization amount, the soil alkali-hydrolyzed nitrogen, available phosphorus, available potassium and seedling growth index increased first and then decreased with the decrease of irrigation amount. Among them, the effect of irrigation was most significant in the range of 700-850 mL/time (treatment TG2 and TG3). The soil alkali-hydrolyzed nitrogen, available phosphorus and available potassium of TG2 and TG3 treated seedlings were significantly higher than those of TG1, with an increase of 15.96%, 23.58% and 12.25%, and 13.33%, 7.53% and 18.37%, respectively. Plant root length and root vigor of TG2 and TG3 were 0.95 and 1.036 times, and 1.125 and 1.14 times those of TG1, respectively. Seedling leaf area, leaf water content and chlorophyll content also increased. The content of total nitrogen, phosphorus and potassium in leaf were significantly higher than those of TG1. The plant height and ground diameter of TG2 and TG3 were the highest, which were 30.67 cm and 8.37 mm, and 32 cm and 8.25 mm, respectively. In summary, under drip irrigation, when the irrigation amount is 700-850 mL/time, it can effectively improve soil fertility and soil environment, and promote the growth of walnut seedlings.

Key words: walnut, drip irrigation, irrigation amount, soil physical and chemical properties, growth and development

CLC Number:

S664.1

HUANG Yali, MA Fengyun, WANG Xia, HAO Jun, DU Zhenyu, LIU Fangchun, SHI Qun, MA Bingyao. Effects of Drip Irrigation Amount on the Growth of Walnut Seedlings[J]. Chinese Agricultural Science Bulletin, 2022, 38(22): 62-68.

Figures/Tables 6

References 28

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代号	处理	施肥量	灌水量/(mL/次)
TG1	滴灌施肥+100%灌水量	60%施肥量	1000
TG2	滴灌施肥+85%灌水量		850
TG3	滴灌施肥+70%灌水量		700
TG4	滴灌施肥+55%灌水量		550
TG5	滴灌施肥+40%灌水量		400

代号	处理	施肥量	灌水量/(mL/次)
TG1	滴灌施肥+100%灌水量	60%施肥量	1000
TG2	滴灌施肥+85%灌水量		850
TG3	滴灌施肥+70%灌水量		700
TG4	滴灌施肥+55%灌水量		550
TG5	滴灌施肥+40%灌水量		400

处理	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)
TG1	30.45±0.60bc	10.22±0.17c	108.89±3.85bc	10.10±0.53a
TG2	35.35±3.21a	12.63±0.23a	122.23±1.39a	10.52±0.39a
TG3	34.51±3.22ab	10.99±0.36b	128.89±1.01a	10.30±0.28a
TG4	32.55±2.10abc	9.10±0.32d	115.33±0.67ab	10.02±0.18a
TG5	28.35±2.10c	8.91±0.70d	94.89±2.15d	10.07±0.51a

处理	碱解氮/(mg/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)
TG1	30.45±0.60bc	10.22±0.17c	108.89±3.85bc	10.10±0.53a
TG2	35.35±3.21a	12.63±0.23a	122.23±1.39a	10.52±0.39a
TG3	34.51±3.22ab	10.99±0.36b	128.89±1.01a	10.30±0.28a
TG4	32.55±2.10abc	9.10±0.32d	115.33±0.67ab	10.02±0.18a
TG5	28.35±2.10c	8.91±0.70d	94.89±2.15d	10.07±0.51a

处理	全氮	全磷	全钾
TG1	2.82±0.01c	0.22±0.003cb	1.98±0.09a
TG2	2.89±0.04b	0.25±0.018b	2.07±0.13a
TG3	3.07±0.04a	0.30±0.026a	2.11±0.05a
TG4	2.39±0.03d	0.20±0.025c	1.93±0.17a
TG5	2.32±0.03e	0.18±0.007c	1.69±0.03b